Villager trading in Minecraft: professions, workstations, best trades
emeralds for raw meat, Dried Kelp Blocks and Sweet Berries

A Dried Kelp Block is nine dried kelp packed together, a renewable fuel.
It is made with the Crafting Table from 9 × Dried Kelp. It is mined with a hoe. It can be composted: each one has a 50% chance to add a layer to a Composter. As fuel it burns for 200.1 seconds in a Furnace, enough to smelt 20 items.
It smelts about twenty items in a furnace and turns back into nine dried kelp. Combined with a kelp farm, it makes an endless fuel supply, and it can also be composted.
9 × Dried Kelp → Dried Kelp Block
// Slots with several items cycle through every accepted option.
emeralds for raw meat, Dried Kelp Blocks and Sweet Berries
At the Crafting Table: 9 × Dried Kelp give 1 × Dried Kelp Block. Mining the block drops it. Bought by Villager: Butcher (Expert).
It is a renewable fuel block. It is an ingredient in one recipe: Dried Kelp.
The fastest tool is the hoe.
Yes. Each Dried Kelp Block put in a Composter has a 50% chance to add a layer (the first layer in an empty Composter always works). After 7 layers the Composter gives Bone Meal.
Yes. In a Furnace it burns for 200.1 seconds, enough to smelt 20 items.
Yes: fire can spread to it and destroy it.