During a two night stay in Aug 2019 my wife and I had dinner at two Orvieto restaurants. One (which is in the Rick Steves 2019 Italy guidebook) was a notch below forgettable - so I won't mention it here.
The other, Hostaria Posterula, was an excellent experience. Great food in charming ambiance with warm service. We found Hostaria Posterula in the Italian slow food restaurant book "osterie d'Italia guida 2019." Located an easy 5 minute walk from Orvieto's town center toward the funicular. No tourists besides us when we dined. Menu in Italian only.
FOOD: Excellent. One of the best places we dined during our 3 weeks in Italy. The chef came out and checked on us after each dish.
- Caprese con mozzarella di bufala e pomodori arrosto: 5.0. The buffalo mozzarella was incredibly light and pleasing, and was delivered on a bed of arugula. The tomatoes were sweet and fresh - and served warm with herbs. After we raved to him about the mozzarella, the chef smiled and said it was the best in Italy, from near Pompeii.
- Umbrichelli al tartufo nero: 5.0. Black truffles with house-made pasta. We split one order. Outstanding, and the (reasonably-priced) local sangiovese wine the restaurant suggested paired very well.
- Ossobuco all'orvietana: 4.0. We split one order between us. Excellent.
- Zuppa inglese: 4.5. Dessert. The chef explained that this "English Soup" dessert was a legacy of the British presence during WW2. Light and not-too-sweet.
AMBIANCE: Indoor and outdoor seating. Interior nicely done, and looked new. Slow sensual jazz at background volume.
SERVICE: Friendly and prompt. Chef checked on us with each course, and provided us a warm goodbye.