Cook rice in boiling salted water according to package instructions. Wash meat, dab dry and cut into cubes. Peel and finely dice onions. Clean the mushrooms, wash them briefly if necessary.
Heat the oil in a pot. Brown the meat all around. Fry onions and mushrooms for about 5 minutes. Season with salt and pepper. Dust with flour and sauté briefly. 3⁄4 l Pour on water and cream.
Bring to the boil, stir in the stock and simmer for about 10 minutes. Add the frozen peas and simmer for about 3 minutes. Season ragout with salt, pepper and lemon juice. Serve everything.