31st Union offers food, beer and wine, all from California vendors. The restaurant offers a seasonal menu of rotating dishes that include small plates, cheese boards, salads, snacks and desserts. All ingredients are locally sourced and come from a variety of nearby farms and creameries. The bar feature seven beer taps as well as six kegs of red and six kegs of white wine. The restaurant takes reservation for parties of six or more; smaller groups will be seated in order of arrival.