TIP: King Boletes (Boletus edulis) do not grow wild in Illinois. Mushroom hunters find them during the summer in the mountains, and in cool northern forests worldwide. It has many names: Porcini. Cep. Steinpilz. Karl Johann. Everybody agrees, regardless of their tongue, this robust-stemmed wild mushroom officially known as Boletus edulis is the most prized of the world’s bolete species. And while the flavor can vary from mild to supremely savory, know that European varieties have the best reputation. Dried Boletus edulis works perfectly well for this recipe--or substitute your choice of fresh wild mushrooms. Store-bought Button Mushrooms also work perfectly well. It’s a versatile opportunity to discover the souffle.