Keep the truffle season going with these summer truffle slices! The black summer truffles (Tuber aestivum) are sliced & contained in sunflower seed oil (low in saturated fat). You should never cook truffles. When you are finished cooking a dish that you would like to add truffles to, mix these lovely slices in. When these truffle slices are lightly warmed, they will release the scent and flavor that gives them their renowned reputation.