Start by cutting the organic chicken breast fillet, half zucchini, red bell pepper, and small onion into equal cubes. Thread the chicken pieces and vegetables alternately onto skewers. Brush everything all around with olive oil and season with pepper and salt.
Heat a grill pan over high heat or light the barbecue. Place the skewers on the hot surface and grill them for about ten to fifteen minutes until cooked through. Turn them regularly so the chicken is completely cooked and the vegetables develop nice grill marks.
Make the tzatziki while grilling. For this, coarsely grate the quarter cucumber and squeeze out the excess liquid by hand. Mix the grated cucumber in a bowl with the organic Greek yogurt. Press the garlic clove over the mixture and stir the sauce thoroughly together.
Remove the cooked skewers from the grill and place them directly on a plate. Serve the warm chicken satay with the homemade, cold tzatziki alongside.