Clean and rinse shrimps. Place shrimps in a strainer to remove any excess water. Heat oil in a pan over medium heat. Add garlic, shrimp and onion. Let fry for about 2 minutes. Add cabbage, tomatoes, black pepper and salt. Let fry for about 3 - 4 minutes then add thyme and rice. Only stir to blend all ingredients. Add water and gently stir. Let rice boil until water is almost evaporated. Cover and lower heat. Let cook for about 20 to 25 minutes until water has completely evaporated and rice is fully cooked and fluffy. This may take an additional 5 to 10 minutes depending on the brand of rice. Serve hot with a meat or fish dish or by itself.