Shrimp and Vegetable Kabobs

Ingredients

• 3/4 cup olive oil
• 1/3 cup lemon juice
• 1 1/2 teaspoon black pepper
• 2 garlic cloves, minced
• 1/2 teaspoon salt
• 1/2 teaspoon sugar
• 1/2 teaspoon crushed red pepper flakes
• 1/2 teaspoon lemon zest
• 16 raw large shrimp, peeled and deveined
• 1 red onion, cut into 8 wedges
• 8 large mushrooms, cut in half
• 8 grape tomatoes
• 8 metal skewers (or wooden skewers soaked in water to prevent flare-ups)