Peel and chop the onion. Heat 1 tablespoon of oil in a saucepan. Fry the onion until transparent. Add deep-frozen spinach and milk, bring to the boil, cook according to package instructions
Dab meat dry and cut into strips. Heat 1 tablespoon of oil in a coated pan, fry the meat for 4-5 minutes, turning, and remove. Add 2 tablespoons of oil to the hot frying fat. Fry the spaetzle for 3-4 minutes, turning them over, season with salt and pepper.
Mix the spinach, smoked pork loin and spaetzle and place in 4 ovenproof dishes. Grate the cheese and sprinkle over the top. Grill under the preheated grill of the oven for 3-5 minutes until golden brown