Meatballs with Peppers and Pineapple

INGREDIENTS

• 1-1/4 pound Ground Beef
• 1/2 whole Onion, Diced Very Finely
• 1 whole Egg
• 1/2 cup Panko Bread Crumbs (or Regular Breadcrumbs)
• 1 teaspoon Kosher Salt
• Freshly Ground Black Pepper, To Taste
• 1/2 teaspoon Crushed Red Pepper, More To Taste
• 1/4 cup All-purpose Flour
• Canola Oil, For Frying
• 2 whole Green Bell Peppers, Seeded And Diced Roughly
• 1-1/2 cup Fresh Pineapple Chunks
• 2 cups Beef Stock Or Broth
• 2 Tablespoons Soy Sauce
• 1/2 cup Sherry Or White Wine Vinegar
• 1/3 cup Sugar
• 1 Tablespoon Cornstarch
• Salt To Taste
• Crushed Red Pepper, To Taste
• Extra Beef Stock If Needed