Mix flour, eggs, milk and 1/2 teaspoon salt to a smooth dough. Let it swell for 20-30 minutes. Cut bacon slices into thirds. Fry about 12 pieces of bacon crisply in two pans (approx. 20 cm Ø).
Spread 1/8 of the batter in each pan and bake the pancakes from both sides until golden brown. Add a little oil if necessary when turning. Bake 8 pancakes one after the other and keep warm.
Wash and halve the tomatoes. Clean and wash spring onions and cut into fine rings. Heat oil in a pan. Sauté the tomatoes for about 3 minutes, add the spring onions and fry briefly.
Season with salt and pepper.
Coarsely crumble feta. Fill 2 pancakes each with the tomato filling, sprinkle with feta, fold up and arrange on a plate. Serve immediately.