Thaw Wan Tan leaves at room temperature. Peel onion and garlic and dice finely. Heat the oil in a frying pan. Fry the minced meat for 5-6 minutes while turning it. Stir in onion and garlic and steam for 4-5 minutes. Add strained tomatoes and season with salt and pepper.
Wash basil, shake dry, pluck leaves from the stalks and chop coarsely. Mix half of the chopped basil with ricotta in a bowl and season with salt and pepper.
Grease the muffin troughs. Cut circles from the baking paper (approx. 12 cm Ø) and place them in the recesses of a muffin tray. Put 2 Wan-Tan dough sheets on the bottom of each tray and let the ends protrude slightly. Fill each well with 2 tbsp. ricotta and meat mixture. Place another Wan-Tan sheet over the filling and press gently. Spread another 2 tablespoons of ricotta and meat mixture over it. Grate the mozzarella and spread it on top by the spoonful.
Bake mini-lasagnes in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for approx. 15-20 minutes. Remove, let cool and sprinkle with the remaining basil.