Grilled Vegetable Kebabs with Grilled Lemon Dressing

extra virgin olive oil

Dijon mustard

fresh rosemary

garlic clove, minced

portobello mushroom caps, quartered

zucchini, halved lengthwise and sliced 1/4 inch thick

red bell peppers, stemmed, seeded, and cut into 1 1/2 inch pieces

lemons, quartered