Island Pork Burgers

Ingredients

• 1 1/4 pounds lean ground pork
• 1 tablespoon grated lime peel
• 1 teaspoon dried thyme leaves
• 1/2 teaspoon ground allspice
• 1/4 - 1/2 teaspoon crushed red pepper
• 1/4 teaspoon salt
• 1 medium red onion, cut into slices
• 8 slices French bread
• 1 tablespoon olive oil