The portabella mushroom is one of the most popular eating mushrooms and it’s often cooked on a barbecue to enhance its flavor and then eaten as a hamburger. It is just as often sliced and sautéed to be used as a side dish. This mushroom kit grows several crops of mushrooms over a 2-month period of time. The Heirloom Portabella Kit consistently grows large portabella mushrooms with little to no effort. These mushrooms are thick and can often grow as large as the opening of the casing. The kit contains inoculated mushroom compost, casing and instructions. All you have to do is just add water.