Defrost the peas. Wash potatoes and cook in boiling water for about 20 minutes. Peel and halve kohlrabi and cut into thin slices. Peel, wash and slice carrots.
Cook vegetables in boiling salted water for about 5 minutes. Drain potatoes, quench, peel and cool. Cut potatoes into slices. Heat oil in one large or 2 small ovenproof pans.
Brown the potatoes and vegetables in it. Season with salt and pepper. Beat the eggs and 100 ml milk. Season with salt and nutmeg. Pour egg milk over potatoes and vegetables. Let it simmer in the preheated oven (electric cooker: 175 °C/ circulating air: 150 °C/ gas: level 2) for about 10 minutes.
Mix the quark and 6 tablespoons of milk. Season with salt and pepper. Wash the sorrel, dab dry and remove the lower stems. Cut sorrel into fine strips and fold into the quark.
Arrange tortilla and curd together.