Grilling: Pork Souvlaki with Pita and Tzatziki

INGREDIENTS

• 1/2 cup olive oil
• 1 small red onion, finely chopped
• 2 garlic cloves, minced
• 4 tablespoons fresh lemon juice
• 2 tablespoons red wine vinegar
• 2 teaspoons Greek oregano
• Salt and Pepper
• 2 cups of Greek yogurt
• 1 English cucumber, peeled and grated
• 4 cloves of garlic, minced
• 2 tablespoons lemon juice
• 2 tablespoons extra-virgin olive oil
• 1 1/2 lbs pork loin, trimmed of silver skin and excess fat, cut into 1-inch cubes
• Wooden skewers, soaked in water for 30 minutes before use
• Pocketless Pita