According to Trip.com data, these 3 restaurants are close to National Trust - Nuffield Place and have great user reviews:
1. The Little Angel, 10.09km from National Trust - Nuffield Place
2. Spice Merchant - Henley on Thames, 9.8km from National Trust - Nuffield Place
3. Bistro at The Boathouse, 10.05km from National Trust - Nuffield Place