Pomegranate Roast Pork

Name: Pomegranate Roast Pork
Ingredients: 2 large cloves garlic, grated; 1 tablespoon salt; 1/4 teaspoon black pepper; 700 grams (25 ounces) pork tenderloin, tied into a roast; 1 tablespoon vegetable oil; 1 medium onion, sliced; 2 tablespoon pomegranate molasses; 1/4 cup red wine; 1/2 red onion, sliced; 1 tablespoon sumac; 1 small tomato, seeded and diced; 1/4 red bell pepper, diced; 1/4 green bell pepper, diced; 1/4 cup black olives, sliced; 1/2 preserved lemons, roughly chopped; 1/2 bunch flat-leaf parsley, chopped