Clean, wash and cut the cauliflower into florets. Blanch the florets in boiling salted water for about 3 minutes, pour into a sieve, rinse cold and drain. Peel and finely dice the shallots.
Cut the bacon into strips. Wash the tomatoes. Wash rosemary, dab dry, remove needles from twigs and chop finely. Wash parsley, dab dry and chop leaves finely.
Heat the oil in a pan, drain the bacon. Add the shallots and fry for about 2 minutes, remove. Sauté the cauliflower in the bacon fat while turning. Add tomatoes and rosemary and fry for another 5 minutes.
Season with salt and pepper, add bacon and shallots again. Sprinkle with parsley.