Francesco's™ All Natural Hole In The Wall Gourmet Mushroom Sauce. Sauce story: The hole in the wall restaurant is a culmination of forty years cooking experience by Francesco and his father. Francesco's love of cooking and his desire to satisfy peoples culinary tastes is what has made him a success in his Chicagoland Trattoria which attracts long waits by his patrons and celebrities. Throughout his forty years of cooking, Francesco and his fathers' hard work reflected their love of food and respect for their patrons demand for excellent sauce by always using the finest tomatoes and freshest ingredients. No preservatives added. 866-729-1801.