1. Thread the meat, shrimp, cherry tomatoes, mushrooms, yellow peppers and zucchini onto skewers. Cover and chill the kebabs until you are ready to cook.
2. To make the baste, mix together the olive oil, lemon juice, mustard and desired seasoning.
3. Preheat the barbecue or grill and arrange the kebabs on the rack. Brush with the baste, stirring it first to make sure the ingredients are blended. Cook for 5-10 minutes, turning often, until the shrimp turns a pink and the vegetables are just tender. Serve while still hot by its self or over a bed of lettuce.