 Lactarius deterrimus is an edible mushroom , but is much less appreciated than the similar L. deliciosus . The first tastes slightly bitter and is often infested by maggots . Like L. deliciosus , this fungus is mainly stir @-@ fried in butter or oil ; if it is cooked in water , the flesh becomes very soft . Young fruit bodies can be also pickled , or dried for later use . As the fungus is often heavily infested by maggots , skilled mushroom pickers prefer young fruit bodies . The urine discolours to red if a large amount of milk caps are eaten , but this is entirely harmless and is not evidence for an impairment to health . The red @-@ coloured <unk> compounds , ingested with the mushroom food , are more or less excreted with the urine . 
