Rub the peel of the lime and then squeeze it. Divide the cauliflower into small florets and cook in the steamer until firm to the bite.
In the meantime, sauté the spring onion and garlic in the hot butter. Deglaze everything with the broth, add 2 teaspoons of lime juice and the zest and green pepper and let it simmer a little. Add the cream and crème fraîche. Let everything just simmer gently. Season the sauce with salt and pepper and mix in the parsley.