In the activities Temple Trekking/Burgh de Rott Ramble, cooked lean snail can be given to the player's follower for the trek. There is a right-click option to 'Grind' the lean snail. This is used to produce Blamish snail slime used in the Blamish oil for the quest, Heroes' Quest. You are required to have a sample bottle in your inventory to collect it.