Put the frozen vegetables in a pan without fat and fry for about 4 minutes, turning. Whisk sour cream and eggs. Season with salt and pepper. Unroll the dough (remove baking paper) and press it into a greased tart tin (28 cm Ø).
Prick the pastry base several times with a fork. Spread the vegetables on top. Pour over the mixture. Bake in the preheated oven (electric: 200 °C/ gas: level 3) for about 25 minutes. Cut the cheese into slices and place them on the tart in a star shape.
Bake for another 10 minutes. Sprinkle with fresh herbs and serve garnished with a bouquet of herbs.