Mix the egg, 1 pinch of salt, flour and milk to a smooth dough. Let the dough swell for about 30 minutes. Drain the corn. Finely dice the tomatoes. Cut olives into rings. Clean, wash, dab dry and cut lettuce into strips.
Mix everything together. Cut the mozzarella into slices. Bake a pancake in a coated pan (32 cm Ø). Put the pancakes on a plate and spread with pesto. Add the salad-olive mixture and wrap it up like a wrap.
Quarter them and put them in an ovenproof dish. Spread mozzarella slices on and between the pancakes. Bake under the preheated grill for about 5 minutes. Garnish with thyme.