1 (1 pound) pork tenderloin
1 small onion, chopped
2 tablespoons lemon juice
1 tablespoon minced fresh parsley
2 garlic cloves, minced
3/4 teaspoon dried thyme
1/8 teaspoon pepper
CUCUMBER SAUCE:
1 small tomato, seeded and chopped
2/3 cup reduced-fat plain yogurt
1/2 cup chopped seeded cucumber
1 tablespoon finely chopped onion
1/2 teaspoon lemon juice
1/8 teaspoon garlic powder