Steamed savoury egg custard

Steamed eggs custard regularly appear on my mom's diner table; however, I have never have the urge to make one since moving out. Then I stumbled upon this recipe ; which looks so simple and manageable plus promises a smooth silky finish, so I say why not make it?
Verdict : wow, so smooooth plus an extremely easy recipe! The most attention you need is making sure the water do not get too hot. That only takes up 15 mins. of your time.
Go here for the recipe at The Kitchn

Korean-Style Steamed Eggs (Gyeran Jjim)

Serves 1-2

2 large eggs
1/4 teaspoon salt
1/2 cup water, plus more for filling pot
1/2 scallion, chopped
1/4 teaspoon toasted sesame seeds
Combine the eggs, salt, and 1/2 cup water in a heat-safe ceramic bowl, such as a ramekin or small ddukbaegi. Whisk until well combined and foamy.
Place the bowl in a pot. Fill the pot with hot (not boiling) water to come halfway up the sides of the bowl. Cover the pot, preferably with a clear glass lid so you can easily watch the water and eggs. Cook over low-medium heat for 12 minutes, making sure the water stays at a gentle simmer.
Sprinkle the scallions and sesame seeds on top of the eggs and continue to cook for about 3 minutes or until the eggs are set. They should be firm but jiggly.
Carefully lift the bowl from the pot and serve.
Some variations:
• Add chopped vegetables like red bell peppers, carrots, zucchini, mushrooms, or onions to the egg and water mixture
• Add gochugaru (red pepper) along with the scallions and sesame seeds
• Substitute brined baby shrimp, fish sauce, or soy sauce for salt
• Substitute stock for water