Retrieve the spent grain from the beer process. If you can, dehydrate it, if not try to take as much water out of the spent grain as possible.
Part a: Mix 100ml of Water with 7.5g of agar agar and 5ml of glycerine.
Part b: Mix 150ml of water with 15g of sugar to dilute the sugar and the 3.6g of calcium propionate. Then pour the spent grain, put this mix to boil, once it does, add the Part a mix and wait till it boils again.
Pour in a mold, being careful not to leave air bubbles as you pour it in.