Combine the quark, dill, lemon juice and oil, season with salt.
Boil the potatoes, uncovered, in boiling salted water for approx. 15 mins. until soft, drain. Heat the oil in the same pan, add the romanesco broccoli, cover and sauté for approx. 10 mins., stirring occasionally. Add the radishes and cook for a further 5 mins. season with salt. Return the potatoes to the pan and heat gently. Garnish with dill.
In a non-stick frying pan, gently fry the bacon until crispy, remove. Season the fish fillets and fry for approx. 2 mins. on each side. Serve the fish with the bacon on top of the vegetables, scatter over the lemon zest and serve the quark alongside.