Prepare the grape leaves: If using preserved grape leaves, rinse them thoroughly under cold water to remove any excess brine. If using fresh grape leaves, blanch them in boiling water for about 2 minutes and then cool them under cold running water.
Prepare the filling: In a large mixing bowl, combine the rice, olive oil, parsley, dill, mint (if using), salt, pepper, and lemon juice. For a meat-filled version, add the browned ground beef or lamb to the mixture and stir well.
Stuff the grape leaves: Lay one grape leaf flat with the vein side facing up. Place a spoonful of the filling at the base of the leaf. Fold in the sides of the leaf and roll it tightly, ensuring the filling stays secure inside. Repeat with the remaining grape leaves and filling.
Cook the stuffed grape leaves: In a large pot, layer the stuffed grape leaves, placing them tightly together to prevent them from unraveling. Add lemon slices on top and drizzle with olive oil. Pour in water to cover the rolls, and bring to a simmer. Cover the pot, reduce the heat, and simmer for 45 minutes to 1 hour until the rice is fully cooked and the leaves are tender.
Serve: Let the dolmades cool slightly before serving. Garnish with fresh herbs and extra lemon wedges. Serve as a side dish, appetizer, or part of a Mediterranean meal.