Part of the Castle Hotel in Market Street, the bright and airy Restaurant Twenty serves local produce in various cooking styles and seats up to 50. Disabled customers can be served downstairs at the bar in the evenings. Perfectly placed in the town centre, it is close to both the river walk up to Llanerchaeron Trail and Harbour Beach.

The Mediterranean style menu offers a tapas selection, seafood dishes and house specialities. The tapas menu, which is served in the café bar, includes bruschetta with Abergavenny goat's cheese, deep fried squid, grilled sardines and sautéed chicken liver in a rich gravy. The main menu lists such dishes as marinated duck breast served with an apple and orange salad, seabass and king scallops served with saffron risotto, tuna supreme with niçoise salad and Moroccan style rack of lamb with couscous. Twenty's signature dish is a selection of mussels, scallops, king prawns and squid, all deep fried in a tempura batter and served with a sweet chilly and basil dip The wine list offers a selection from around the world. Also on offer are real ales such as Cwrw Haf, Evan Evans, Cwrw and Tomos Watkin.