Ramen Eggs (Ajitsuke Tamago) - Calorie & Ingredient Breakdown
Original recipe: Ramen Eggs (Ajitsuke Tamago) - Just One Cookbook by Namiko Chen
The Recipe
Ramen Eggs (Ajitsuke Tamago)
Prep: 5 min | Cook: 10 min | Marinate: 8 hours+ | Serves: 4 (1 egg per serving)
Ingredients
| Ingredient | Amount |
|---|---|
| Large eggs (refrigerated, slightly older eggs are easier to peel) | 4 (50 g each, without shell) |
| Soy sauce | ¼ cup (60 ml) |
| Mirin | ¼ cup (60 ml) |
| Sake (or water) | ¼ cup (60 ml) |
| Sugar | 1 tsp |
Directions
- Make the marinade. Combine the soy sauce, mirin, sake, and sugar in a small saucepan. Whisk to fully dissolve the sugar. Bring to a boil, lower the heat, and simmer for 1 minute. Turn off the heat and set aside to cool completely.
- Boil the eggs. Bring 4 cups (1 L) of water to a full boil in a saucepan. Gently lower each egg, one at a time, into the boiling water with a ladle or strainer. Set a timer for 7 minutes the moment the first egg goes in.
- Simmer gently. Keep the water at a gentle simmer (not a vigorous boil). Rotate the eggs with chopsticks during the first 3 minutes to keep the yolks centered.
- Shock in ice water. After 7 minutes, promptly transfer the eggs to a bowl of iced water and chill for 15 minutes until completely cool.
- Peel the eggs. Crack the shell at the wide bottom end and peel vertically toward the pointy top, dipping in the iced water occasionally to help.
- Marinate. Place the peeled eggs in a small zip-top bag and pour in the cooled marinade. Press the air out and seal just above the eggs so they stay fully submerged. Refrigerate 8 hours or overnight (no longer than 12-24 hours, or they get too salty).
- Serve. Cut each egg in half lengthwise with a fishing line or wire cheese slicer for the cleanest cut. Use as a ramen topping, in bento, or as a snack with furikake or shichimi togarashi.
Key tip: Use a zip-top bag instead of a container - it takes far less marinade to fully submerge the eggs, and you can rotate the bag to coat them evenly. Do not reuse the marinade with new eggs (food safety).
Nutrient Card
Ramen Eggs (Ajitsuke Tamago) (per serving = 1 egg)
Calories: ~90
Protein: 7g
Fat: 5g
Saturated: 2g
Carbs: 2g
Fiber: 0g
Sugar: 2g
Sodium: ~310mg
Cholesterol: ~186mg
Full Nutrition Breakdown
Here is what one ramen egg actually contains. The marinade is mostly discarded - eggs absorb roughly 15-20% of it during the soak. The "absorbed" totals match the per-serving nutrition Just One Cookbook reports.
| Ingredient | Serving (per person) | Calories | Protein | Fat | Carbs | Fiber |
|---|---|---|---|---|---|---|
| Large egg | 1 egg (50 g) | 72 | 6.3 g | 4.8 g | 0.4 g | 0 g |
| Soy sauce (full share) | 1 Tbsp (15 ml) | 9 | 1.6 g | 0 g | 0.8 g | 0.1 g |
| Mirin (full share) | 1 Tbsp (15 ml) | 32 | 0 g | 0 g | 6.5 g | 0 g |
| Sake (full share) | 1 Tbsp (15 ml) | 25 | 0 g | 0 g | 1.0 g | 0 g |
| Sugar (full share) | ¼ tsp | 4 | 0 g | 0 g | 1.0 g | 0 g |
| TOTAL (if marinade fully consumed) | ~142 | ~8 g | ~5 g | ~10 g | ~0 g | |
| TOTAL (as actually eaten, ~17% absorbed) | ~90 | ~7 g | ~5 g | ~2 g | ~0 g |
Note: The egg itself is the dominant macro source. Sodium climbs sharply because soy sauce is about 920 mg of sodium per tablespoon, and roughly 240-310 mg of that gets pulled into each egg overnight.
Where Your Calories Actually Come From
| Component | Calories | % of Total |
|---|---|---|
| The egg (yolk + white) | 72 | 80% |
| Absorbed marinade (mostly mirin sugars) | 18 | 20% |
| Total | 90 | 100% |
The yolk does most of the heavy lifting here. About 55 of those 72 egg calories sit in the yolk along with all of the fat, the choline, and the cholesterol. The marinade is a flavor delivery system, not a calorie one - most of what you whisk together gets poured down the drain.
Macro Split
| Macro | Grams | Calories from Macro | % of Total Calories |
|---|---|---|---|
| Protein | 7 g | 28 cal | 31% |
| Fat | 5 g | 45 cal | 50% |
| Carbs | 2 g | 8 cal | 9% |
| Fiber | 0 g | - | - |
| Alcohol (residual from marinade) | ~1 g | ~7 cal | ~8% |
A 31% protein-to-calorie ratio is exceptional - most "high protein" snacks land around 20-25%. That ratio is why ramen eggs feel so much more satisfying per bite than a piece of toast or a granola bar of similar calories.
Health Benefits at a Glance
| Ingredient | Key Nutrient/Compound | What Research Says |
|---|---|---|
| Egg yolk | Choline (~147 mg per yolk) | Choline is a precursor to acetylcholine, a neurotransmitter linked to memory and focus. One ramen egg covers about 27% of a woman's and 26% of a man's daily choline needs - useful for brain function, especially during pregnancy and aging. |
| Egg yolk | Lutein and zeaxanthin | These carotenoids accumulate in the retina and research links them to lower risk of age-related macular degeneration and improved contrast sensitivity. They also support skin elasticity and protect against blue-light damage. |
| Whole egg | High-quality protein (PDCAAS 1.0) | Eggs score the highest possible biological value for protein - meaning your body uses more of it. Research links a leucine-rich protein source post-workout to better muscle protein synthesis, which matters for recovery and lean mass retention as you age. |
| Whole egg | Selenium and vitamin B12 | One egg covers about 28% of your daily selenium and 23% of vitamin B12. Both support thyroid function and energy metabolism - selenium is also tied to immune function and hair strength. |
| Soy sauce (absorbed) | Naturally fermented amino acids and umami compounds | Traditionally brewed soy sauce contains free glutamates and small amounts of antioxidant compounds from fermentation. The flavor punch also means you need less salt elsewhere in the meal. |
A strong pick if you're trying to lose weight without feeling hungry - the protein-and-fat combo with almost no carbs is one of the most satiating macro splits you can build into a meal. The choline and lutein in the yolk also make this a meaningful brain and eye-health snack, not just a flavorful topping. Just keep an eye on sodium if you're stacking it with broth-heavy ramen, which already runs high.
Smarter Swaps (With Real Numbers)
Swap 1: Low-sodium soy sauce
- Before: 1 Tbsp regular soy sauce - 9 cal, 920 mg sodium
- After: 1 Tbsp reduced-sodium soy sauce - 8 cal, 530 mg sodium
- Result: Same flavor, ~40% less sodium per serving (~125 mg saved)
Swap 2: Skip the sugar, double the mirin
- Before: 1 tsp sugar + ¼ cup mirin - 146 cal across the batch
- After: No added sugar, mirin alone provides the sweetness - 130 cal across the batch
- Result: Saves ~4 cal per serving and one ingredient. The flavor is slightly less round but cleaner.
Swap 3: Sake → water
- Before: ¼ cup sake - 100 cal across the batch (~25 cal per serving share, ~4 cal absorbed)
- After: ¼ cup water - 0 cal
- Result: Saves ~4 cal per serving as eaten. You lose some umami depth but keep the marinade alcohol-free and friendlier for kids or pregnancy.
Swap 4: Egg whites only
- Before: 1 whole large egg - 72 cal, 6.3 g protein, 4.8 g fat
- After: 2 large egg whites (no marinade absorption changes) - 34 cal, 7.2 g protein, 0 g fat
- Result: Cuts calories by more than half and bumps protein. You lose the jammy yolk magic - so this is more about eating 5+ eggs without the fat load than replacing the classic.
The Ultra-Lean Stack: All Swaps Combined
Egg whites + low-sodium soy sauce + no added sugar + water instead of sake = roughly 48 calories per serving, 8 g protein, 0 g fat, ~1 g carbs, ~190 mg sodium. You lose the yolk and most of the alcohol depth, but you have a near-zero-fat, ultra-high-protein topping that fits almost any cut.
Fit It Into Your Day
| Daily Target | Recipe % of Day | Remaining Calories | What That Leaves You |
|---|---|---|---|
| 1,500 cal | 6% | 1,410 cal | Easy fit. Leaves room for two full meals plus a snack. |
| 2,000 cal | 4.5% | 1,910 cal | Almost invisible against your daily budget. |
| 2,500 cal | 3.6% | 2,410 cal | A near-free protein hit on most days. |
| 3,000 cal | 3% | 2,910 cal | Stack two if you want; you will still be at 6% of the day. |
Common Pairings and What They Add
| Side | Calories | Running Total |
|---|---|---|
| 1 ramen egg (you are here) | 90 | 90 |
| + Bowl of shoyu ramen with broth and noodles | ~500 | 590 |
| + Half cup steamed white rice | 100 | 690 |
| + Side of seaweed salad | 70 | 760 |
| + Second ramen egg | 90 | 850 |
A full ramen-shop bowl with two eggs and a side typically lands between 700-900 calories. The eggs themselves are the smallest part of the bill - the broth and noodles do most of the damage.
How It Compares
| Version | Calories | Protein | Fat | Carbs |
|---|---|---|---|---|
| 1 plain hard-boiled egg | 78 | 6.3 g | 5.3 g | 0.6 g |
| 1 plain soft-boiled egg | 72 | 6.3 g | 4.8 g | 0.4 g |
| 1 ramen egg (this recipe) | 90 | 7 g | 5 g | 2 g |
| 1 fried egg in 1 tsp butter | 105 | 6.3 g | 9 g | 0.4 g |
| 2-egg ramen topping (typical ramen shop) | ~200 | 14 g | 11 g | 4 g |
The marinade adds about 18 calories and 1 gram of protein vs. a plain soft-boiled egg, mostly from the absorbed mirin sugars and a trace of soy sauce protein. The big difference is sodium - a ramen egg has roughly 240-310 mg of sodium compared to ~65 mg in a plain egg.
Recipe from Just One Cookbook by Namiko Chen. Nutrition data sourced from USDA FoodData Central. Individual results vary by brand, cooking method, and portion accuracy. When in doubt, weigh your ingredients.