Prepare Tomato Mixture: Cut cherry tomatoes into quarters and place in a bowl with their juice. Add chopped mint, basil, oregano, sugar, salt, pepper, finely chopped small onion, and white wine vinegar. Mix and rub ingredients together by hand.
Add Tomato Paste and Flour: Add tomato paste to the mixture and mix. Then add self-rising flour gradually and mix until the flour absorbs the tomato juices.
Add Feta Cheese: Break feta cheese into large pieces and gently fold into the mixture without overmixing to keep chunks intact.
Form Meatballs: Shape the mixture into meatballs by pressing with the palm of your hand. Coat each meatball lightly with cornflour.
Fry Meatballs: Heat sunflower oil to about 170°C. Fry 4-5 meatballs at a time for about 2 to 3 minutes until golden and cooked through. Remove with a slotted spoon and drain on absorbent paper.
Prepare Feta Sauce: In a blender or food processor, combine 150 g feta cheese, 250 g strained yogurt (1.5% fat), 1 teaspoon garlic powder, 1 teaspoon paprika, and salt to taste. Pulse until desired consistency, leaving some texture if preferred.
Serve: Spread feta sauce on a serving platter, place tomato meatballs on top, and serve immediately.