Wash and dice the zucchini. Heat the oil and cook the zucchini for 1 minute. Add the sugar and stir in the blueberries. Season to taste with salt and cayenne pepper. Let cool.
Cut the lamb fillet into 3 cm square cubes. Brush with olive oil. Season to taste with salt and pepper. Make the skewers and sauté for 2 to 3 minutes. Serve the lamb skewers with the salsa.