Orange Vegetable Kabobs

Ingredients

• 1 large sweet onion
• 1 large unpeeled navel orange
• 1 medium sweet red pepper, cut into 1-inch pieces
• 1 medium sweet yellow pepper, cut into 1-inch pieces
• 8 medium fresh mushrooms
• 8 cherry tomatoes
• 2 small yellow summer squash, cut into 1-inch slices
• 1/2 cup olive oil
• 1/3 cup lemon juice
• 1-1/2 teaspoons sugar
• 1 teaspoon salt, optional
• 1/4 teaspoon garlic powder
• 1/4 teaspoon pepper
• 2 tablespoons orange juice