2 eggs
1 to 1.25 pounds ground beef
1 small red onion, chopped
1/2 cup milk
1 1/2 cups ketchup
1/4 cup prepared yellow mustard
1/4 cup red wine vinegar
1 teaspoon crushed sea salt
1 1/2 cups cracker crumbs
1/2 cup brown sugar

Preheat oven to 350 degrees. Beat all ingredients in a large mixing bowl. Form the mixture into balls and place on a 9×13 baking dish. Bake in the preheated oven until the meatballs are no longer pink in the center, approximately one hour.