Jewsuph

So I've gotta be missing something, but I've been trying to figure out how to get the fat cooked into lard, used charcoal for higher heat, made sure the math added up for the recipe (.2 water for every 1 lump of fat), and used various amounts and all 3 diff tools to try and get this to work, but the bar never fills and its always too cold. Someone please just tell me there's like a lid or some switch im missing or something lol. Im on 1.7.3