The name means "gourmet owl," and, indeed, chef Peter Schmalen caters to gourmets in the 19th-century Palais Walderdorff complex opposite the cathedral. Truffles are a specialty, and the fish is always excellent. Wines from top German estates, particularly from the Mosel, and an extensive selection of red wines are available. Lots of windows lend a light, airy look to the restaurant, and a replica of one of Michelangelo's Sistine Chapel paintings is on the ceiling. There's courtyard seating in summer.