Ajitsuke Tamago (Ramen Eggs)
Ajitsuke tamago are marinated soft-boiled eggs, and the key variable is the yolk texture before marinating. Eggs are boiled for exactly six and a half minutes in already-boiling water, then immediately transferred to an ice bath for five minutes. The white is fully set; the yolk is jammy at the edges and soft at the center. Peeled eggs go into a zip-lock bag or container with a marinade of soy sauce, mirin, sake, and a small amount of sugar, then refrigerate for at least four hours. Overnight produces a more deeply flavored result. The marinade penetrates the surface of the white, turning it deep amber, but the yolk absorbs flavor more slowly. A 24-hour marinated egg has a richer, more complex flavor than a 4-hour one. These eggs make or break a bowl of ramen because they provide the only truly rich, yielding element in a broth-and-noodle bowl. Slice lengthwise with a thin, sharp knife or dental floss to reveal the gradient interior.
Instructions
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Bring a pot of water to a rolling boil. Gently lower the eggs in with a spoon. Boil for exactly 6 minutes and 30 seconds.
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Transfer immediately to an ice bath and chill for 5 minutes. Peel carefully — the eggs are still soft and delicate.
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Make the marinade: Combine soy sauce, mirin, water, and sugar in a small saucepan. Heat briefly until the sugar dissolves. Let cool to room temperature.
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Place the peeled eggs in a zip-top bag or container and pour the marinade over them. Make sure the eggs are fully submerged — if using a bag, squeeze out excess air.
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Refrigerate for at least 4 hours, or overnight for deeper flavor and color. Turn the eggs once halfway through if they are not fully submerged.
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To serve, halve the eggs lengthwise. The whites should be golden-brown and the yolks still soft and jammy. Keeps in the marinade for up to 3 days.
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