Ingredients :

• Eggs — Three large eggs, at room temperature if possible — it makes mixing with the cold dashi easier. No need for a special variety, but free-range eggs make a real difference in the yolk color: more orange, more beautiful on the plate.
• Dashi — This is the soul of the dish, don’t neglect it. The best is homemade kombu-katsuobushi dashi, but an instant dashi packet (Kayanoya or Ajinomoto, found in Asian grocery stores) works very well for everyday use. Avoid the jarred powder — it lacks depth and is too salty. Liquid dashi stock in a carton is also fine if you find nothing else.
• Mirin — A slightly syrupy sweet condiment that shouldn’t be replaced just by sugar, at the risk of losing the roundness. It gives the omelet that characteristic shine and a less sharp sweetness. One bottle lasts for months — it’s a useful investment.
• Soy sauce — Just a few drops, only for depth and slight coloration. A light Japanese soy sauce (usukuchi) is ideal for not darkening the omelet, but classic Kikkoman works perfectly.