In a bowl, combine the minced beef, diced onions, finely chopped parsley, egg, and grated Emmentaler cheese. Season with salt, pepper, and Tabasco to taste.
With moistened hands, shape the mixture into oval-shaped croquettes.
Roll the croquettes in breadcrumbs until well coated.
Brush or drizzle the meatballs with oil.
Heat the grill to high heat.
Place greased aluminum foil on the wire rack under the grill grate to prevent the breadcrumbs from burning.
Grill the meatballs for 5 minutes on each side until cooked through (internal temperature 63 °C / 145 °F for ground beef).
Serve immediately.
Pan-fry the meatballs in a heated pan for 5 minutes on each side instead of grilling.