Cook 2 cups of Japanese short-grain rice according to package instructions, then set aside.

In a large skillet, heat 1 tablespoon of butter over medium heat. Add 1 cup of diced chicken and cook until browned, about 5-7 minutes. Stir in 1 cup of vegetables, 1/4 cup of ketchup, and optional 2 tablespoons of red wine. Cook for an additional 3-5 minutes until heated through and slightly caramelized.

While the chicken rice is cooling, crack 4 eggs into a bowl, whisking them with a pinch of salt and pepper. In a non-stick frying pan, melt 1 tablespoon of butter over medium-low heat. Pour in the eggs and gently swirl the pan, cooking until the edges firm up while the center remains slightly runny, about 3-4 minutes.

Carefully spoon the chicken rice mixture into the center of the omelette. Using a spatula, gently fold one side of the omelette over the rice, followed by the other side to encase it. Turn the pan slightly while flipping the omelette onto a plate, ensuring the seam side is down.

Drizzle additional ketchup or demi-glace sauce over the top of your beautifully wrapped Omurice. Optionally, garnish with sliced green onions or chopped parsley. Serve hot.