Preparation time: Clean and wash the cauliflower and broccoli and cut them into small florets. Cook the cauliflower in boiling vegetable stock for about 10 minutes. Add the broccoli florets after about 5 minutes and cook.
Drain the vegetables, catch the broth and keep the florets warm for a short time. Heat the fat in a saucepan and sauté the flour in it until golden brown. Deglaze with stock and cream, bring to the boil and simmer for about 5 minutes.
Wash the meat, dab dry, cut the fat edges several times so that the meat does not bend when roasted. Fry in hot oil in a pan over high heat on both sides.
Fry over medium heat for about 3 minutes on each side. Season with salt and pepper. Wash the chives and cut into small rolls, except for a little bit for garnishing. Add mustard and 2 teaspoons of red pepper to the sauce, season with salt.
Arrange the rump steaks with the vegetables and some sauce. Garnish with remaining chives and red pepper. Add the rest of the sauce.