Wash the zucchini. Peel the carrots. Cut both lengthways into thin slices, possibly with the help of a bread slicer, or plane. Clean and quarter the radishes. Peel the onion and cut into rings or slice.
Marinate the vegetables with oil, orange juice and red wine vinegar. Squeeze in the garlic. Season with herbs, salt, pepper and sugar. Place in an ovenproof dish and place sliced feta cheese on top.
Fry for 30 minutes in a preheated oven at 220 ° C top / bottom heat. Possibly switch to grill function for the last few minutes.