Remove stems from mini tomatoes. Mince onion and microwave in a heatproof container for 1 minute at 600W. Cool. Slice garlic thinly after removing its core.

Soak breadcrumbs in milk. In a separate bowl, mix ground pork, salt, pepper, and soaked breadcrumbs until sticky. Add minced onion and mix well.

Dust mini tomatoes lightly with flour. Take 1/12 of the pork mixture, place a tomato on top, and wrap it to form a ball. Repeat for all 12 tomatoes.

Heat olive oil in a pan and fry the meatballs over medium heat, turning to brown evenly.

Add garlic and sauce ingredients to the pan. Cover and simmer on low heat for 15 minutes.