Chop or chop the onion and garlic and fry in the oil, remove from the heat and mix with lemon juice, mustard and cream.
Peel the zucchini in strips, halve or quarter lengthways, cut into 1/2 cm thick slices and season with salt. Chop the bell pepper and carrot, cut the tomatoes into eighths.
Mix everything, if there is still time, let it steep and sprinkle with chives.