function mcl_vegan.register_compress_recipe (input, output, def)
	def = def or {}

	if def.reversible == nil then def.reversible = true end
	local reversible = def.reversible

	if def.big == nil then def.big = true end
	local big = def.big

	local compress_factor = 4
	if big then compress_factor = 9 end

	if big then
		minetest.register_craft({
			output = output,
			recipe = {
				{ input, input, input },
				{ input, input, input },
				{ input, input, input },
			},
		})
	else
		minetest.register_craft({
			output = output,
			recipe = {
				{ input, input },
				{ input, input },
			},
		})
	end

	if reversible then
		minetest.register_craft({
			type = "shapeless",
			output = input .. " " .. compress_factor,
			recipe = { output },
		})
	end
end