Teriyaki Meatball Sub

I really like this recipe a lot.  I love that it's not the normal meatball sub.  You also can make the meatballs to go along with some noodles or rice or as an appetizer.

TERIYAKI MEATBALL SUB
(serves 4-6)

Ingredients:
*1 tablespoon cornstarch
*1 tablespoon cold water
*1/2 cup brown sugar
*2 cloves garlic, minced
*1/2 teaspoon ground ginger
*1/2 cup soy sauce
*1/4 cup cider vinegar
*1/2 teaspoon ground black pepper
*1 1/2 pounds lean ground beef
*1/4 pound ground pork
*2 eggs
*2 garlic cloves, minced
*1/2 yellow onion, chopped small
*1/2 cup panko bread crumbs
*1/2 teaspoon ground pepper
*1/2 teaspoon salt
*4-6 sturdy sub buns (I like to make my own)
*8-12 slices provolone cheese

Directions:
~In a small saucepan love low heat, whisk cornstarch, cold water, brown sugar, 2 minced garlic cloves, ginger, soy sauce, vinegar and 1/2 teaspoon pepper.
~Simmer for 20-30 minutes, until it thickens.
~Preheat oven to 400 degrees.
~Line cookie sheet with parchment paper or spray pan with a cooking spray.
~In a large bowl, gently stir ground beef, ground pork, eggs, remaining garlic, onion, panko crumbs, 1/2 teaspoon pepper and 1/2 teaspoon salt.
~Form into 2 - 2 1/2 inch meatballs (I use a 1/8 cup to measure them).
~Place meatballs on a cookie sheet.
~Bake for 20-25 minutes or until meatballs are cooked.
~Remove from oven.
~Genlty place meatballs into teriyaki sauce and gently coat.
~Toast insides of sub buns, either in a frying pan or in oven (optional)
~Place meatballs on sub bun.
~Place two slices of provolone cheese over meatballs.
~Place subs back into oven long enough to melt the cheese.
~Remove from oven and drizzle a little more teriyaki sauce over sandwich.

Variations:
`add shredded lettuce and tomato to sub once it's removed from the oven.
`add cooked riced to bottom of sub, before placing meatballs and cheese on it.
`sprinkle chopped green onions over top of melted cheese.
`sprinkle sesame seeds over meatballs.