In Alar del Rey, the restaurant La Cueva (979 13 30 66) is highly recommended.It is very tasty homemade food, there is also a menu here, but if you are going to go, it is advisable to book. The impressive croquettes and attention to the desserts are also very good. This will come in handy if you visit San Andrés de Arroyo because it is close.
Next to Mave, in Olleros, is Bar Feli (979 12 23 85), the town's bar, where you can eat and drink whatever you like and there is usually a good atmosphere.
Also very close, in Becerril del Carpio, you have the teleclub where you can eat and have a drink. Everything is great and you can order food to go.
In Aguilar de Campoo there are many possibilities, both for restaurants and bars and cafes.