Did you know that you can make a perfectly good rennet substitute from a weed that might be growing in your yard? This recipe uses Bull Thistle (cirsium vulgare), a purple thistle that is considered a weed in most places. Check books on wild foraging or edible weeds for proper plant identification. HARVESTING BULL THISTLE Remove the thistle flower head after it has browned a little on the plant. Pick the head before it starts producing thistle down. Take the flowers in and...