For the filling fry the mince in a heated frying pan with sunflower oil. Add sliced ​​mushrooms, tomato sauce, chili sauce and corn. Season with salt, pepper and cumin. For the white sauce in a bowl, mix mayonnaise milk, strained yogurt, pressed garlic and salt. Mix well to obtain a homogeneous mixture. Cut the lettuce leaves into strips and arrange them in a dish like pad. Fill tacos stuffed with minced meat. Pour the sauce and ready. At desired, you can put on top of grated cheese. * In case I use ready tacos, which you can find in the big chain stores.