Gather all the ingredients.
Start by heating Japanese sake in a skillet and let it boil for about 15 to 20 seconds to cook off the alcohol.
In a small bowl, mix the boiled sake with soy sauce, sweetener, grated garlic, and black pepper to make the sauce.
Combine corn kernels and butter in a microwave-safe bowl, cover, and microwave for 15 to 25 seconds until the butter melts. Spoon the buttered corn over a bed of rice on a plate.
Add diced onions and butter to a skillet and cook for 2 to 3 minutes until browned. Remove from the pan and set aside.
In a mixing bowl, combine the ground pork, ground beef, grated garlic, panko, salt, black pepper, egg, half & half, nutmeg, and the browned onions. Mix well with your hands until evenly combined.
Take half of the mixture and gently toss it between your hands to shape it into a ball, then press it into a 1-inch thick patty. Use your thumb to make a small indent in the center to help it cook evenly. Repeat with the remaining mixture and set aside.
Lightly coat a large skillet with cooking spray and heat over medium heat. Add the patties with the indent side up, cover, and cook for 3 to 4 minutes until browned. Flip and cook the other side until browned and cooked through.
Place the cooked hamburger patty on top of the rice, top with butter corn, drizzle with the sauce, and serve warm.