Teriyaki Pork and Beef Burger

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1 pound ground beef sirloin

1 pound ground pork 

1/2 medium yellow onion, grated on the large holes of a box grater

2 tablespoons minced fresh garlic 

Kosher salt and freshly ground black pepper

2 tablespoons unsalted butter

1/4 cup firmly-packed light brown sugar 

1 ripe pineapple, peeled, quartered, cored and cut into 1/4-inch dice

1 dragon fruit, peeled and cut into 1/4-inch dice

1 bunch fresh cilantro, minced

1/4 cup soy sauce 

2 tablespoons minced fresh ginger 

6 hamburger buns