Choose ripe plantains with yellow skins for easier peeling and mashing.Use a potato masher for smoother and more efficient plantain mashing.Add a little lemon juice to the mashed plantains to prevent browning.Pre-measure the ingredients before starting to streamline the process.Use a cookie scoop or ice cream scoop for consistent-sized plantain balls.Keep a bowl of water nearby to moisten hands while shaping the Rellenitos.Fry the rellenitos in batches to ensure even cooking and prevent overcrowding.