aji appetizer meatballs (uruguay)

Ingredients

• 5 tablespoons olive oil, divided
• 1 - medium onion, finely chopped
• 1 - large aji chile (or wax chile), chopped
• 1 - large tomato, chopped
• 1 teaspoon light brown sugar
• - salt and pepper, to taste
• 1 pound ground pork
• 1 cup fresh bread crumbs
• 1/4 cup parmesan cheese
• 1/4 cup currants
• 1/2 teaspoon ground cinnamon
• 2 - eggs, beaten
• - milk, as needed
• - flour, as needed
• - salsa, for serving