Finely chop the onion. Wash the mangetouts, drain and cut into strips. Wash the chervil and chop it, except for something to garnish. Dab meat dry and cut into strips.
Cook the pasta in plenty of boiling salted water for about 10 minutes until al dente.
Heat 1 teaspoon of oil in a coated frying pan. Fry the meat for 2-3 minutes. Season with salt and pepper. Take out.
Steam onion in frying fat until transparent. Add sugar snap peas, 100 ml water and stock, bring to the boil. Add meat again and simmer everything for about 3 minutes. If necessary, thicken sauce slightly. Stir in chervil and sour cream (no longer boiling).
Season to taste. Drain the pasta. Serve with shredded meat and garnish with chervil.