Soak rice: Place the rice in a large bowl, pour boiling water over to cover it, and let soak for 1 hour. Massage the rice with your hand to clean it, drain it through a fine-mesh sieve, and wash it again under running water very well. Let drain well and place it in a large bowl.
Prepare the vine leaves: While the rice soaks, drain the two grape leaves jars. Carefully take the leaves apart and remove the stems. If some of the leaves break, you can put some pieces together when filling them and still be able to get a nice roll.
Cook the vine leaves: Bring a large pot of water to a boil and cook the leaves for about 15 minutes, turning them around in the water 3 or 4 times in between. Drain well.
Prepare ingredients: While the leaves are cooking chop the onion and the herbs as finely as possible. Peel the cloves of 1 ½ of the garlic bulbs and grate them finely.
Mix filling ingredients: Add the onions, herbs, and garlic to the drained rice. Add the cayenne pepper, sweet paprika, black pepper, and about 2 teaspoons of the salt. Mix well, add 2 tablespoons of the pomegranate molasses, about 170 g/ 6 oz/ ¾ cup of the tomato paste, the olive oil, and about half of the lemon juice. Mix very well with your hands.