Heat a skillet over medium heat and add a drizzle of olive oil. Once shimmering, sauté the finely diced onion and minced garlic for about 4-5 minutes, stirring frequently until they become translucent and aromatic.

In a large mixing bowl, combine the sautéed onion and garlic with ground beef, ground pork, panko breadcrumbs, milk, egg, parsley, salt, soy sauce, and ketchup. Use your hands to mix everything together for about 2-3 minutes until it becomes a sticky mixture.

Once fully combined, divide the meat mixture into 6-8 equal portions. Shape each portion into a patty about 1-inch thick, making a slight indentation in the center.

Return the skillet to medium heat and add a bit more olive oil if needed. Place the patties in the pan and cook for about 8-12 minutes, flipping them halfway through.

After the patties are cooked, remove them from the skillet. In the same pan, pour in the sake to deglaze, scraping up all the flavorful bits. Stir in Worcestershire sauce, ketchup, and water, simmering for about 3-5 minutes until the sauce thickens slightly.

To serve, place each patty on a plate and drizzle the sweet and tangy sauce over the top. Pair with steamed rice and fresh vegetables for a complete meal.