Low calories chicken skewers

For ➍
1 medium-sized zucchini
1 medium-sized bell pepper, all colors
1 medium-sized red onion
400 g chicken fillet, raw
½ non-coated lemon
1 tsp olive oil *
250 g tzatziki

Wash the zucchini, halve in length and cut into slices. Wash the bell pepper, remove the seeds and cut into pieces. Peel the onion and cut into slices. Grate the lemon zest and squeeze the lemon. Cut the chicken into cubes and string alternated with the zucchini, pepper and onion on 12 skewers. Mix the lemon juice with oil, pepper and salt and brush the skewers with this. Bake the skewers 12-15 m all around on the barbecue or in the oven at the top.
Serve the skewers with the tzatziki