Grilled Vegetable Panzanella - Martin's Famous Potato Rolls and Bread

Ingredients

• 4 Slices Martin's Potato Bread, grilled then cubed into bite-sized pieces
• 1 Tablespoon Olive Oil
• 8 Crimini Mushrooms, quartered
• 1/4 Sweet Yellow Onion, cut into chunks
• 6 Stalks of Asparagus, tough ends removed, then cut into thirds
• 1 Medium Zucchini, cut into chunks
• 3 Small Firm Tomatoes, quartered
• Salt and Pepper, to taste
• 1/2 Cup Canola Oil
• 5 Tablespoons Seasoned Rice Vinegar
• 1 Tablespoon Red Wine Vinegar
• 2 Cloves Garlic, minced
• 1 Teaspoon Sugar