Mix milk, mineral water, eggs and salt. Stir in flour. Halve the bacon. Spread a small pan (approx. 15 cm Ø) with oil. Fry 2-3 pieces of bacon briefly and pour some dough on each.
Fry for about 2 minutes on each side until golden brown. Bake 7 more pancakes in the same way. Grate cheese roughly. Roll up the pancakes, put them in an ovenproof dish and sprinkle with cheese. Bake in the preheated oven (electric cooker: 225 ° C/ gas: level 4) for 3-4 minutes.