Degrease and wash roast beef and dab dry. Rub with salt and pepper. Place on the fat pan of the oven and pour hot clarified butter over it. Bake in the preheated oven (electric: 225 ° C/ gas: level 4) for about 40 minutes.
In the meantime, thaw the peas. Peel the shallots. Chop about 4 shallots finely. Add the remaining shallots to the fat pan 15 minutes before the end of the cooking time. Spread peas on top just before serving.
Season vegetables with salt and pepper. For the sauce, bring cream and chopped shallots to the boil. In the meantime knead flour and butter and stir into the hot liquid. Season to taste with tomato paste, mustard, brandy, salt and pepper.
Arrange the sliced roast beef with the vegetables and sauce. Serve garnished with parsley. Roast potatoes taste good with it.