To put aside the water of the mushrooms and to cut them very thin. The water of the mushrooms must have passed with a strainer and preserved (about 13 centiliters). In a casserole we loosen some butter to middle fire. We add pasta and mushrooms, we mix while it is cooking for 5 minutes. To unite to this point the water of the mushrooms with salt, pepper, thyme and garlic. While the cooking is being continued we mix until when it won't be absorbed the whole liquid, that is for at least 8-9 minutes. Spent this time to lower the fire and to lengthen with some broth. To continue the cooking mixing for others 4-5 minutes to let dry broth. To serve warm.