If it's a nice, sunny day and you feel like a chilled Sunday seafood lunch, the Quay Four Tavern at the V&A Waterfront is definitely a good place to visit. You can sit outside and watch the comings and goings of the harbour, whilst sipping some chilled Sauvignon Blanc and tucking in to a tasty meal of prawns and chips. If you would like to sit near the edge to see the harbour, I'd make a booking, because the 'good' tables are usually taken pretty quickly.
Whenever I go to Quay Four, I have the prawns and chips special. You can either have 1/2 kilo of prawns for R109, or 1 kilo of prawns for R189. Both are served with your choice of chips, rice or salad and your choice of a lemon butter, garlic or chili sauce. I don't think I could squeeze in a kilo of prawns, so I go for the 1/2 kilo option (see below).
If you aren't so keen on seafood, they also have good burgers. My sister had the Bacon & Guacamole Burger for R89 (see below).
Although they have quite an extensive wine list, I do find it quite pricey. For example, the Durbanville Hills Sauvignon Blanc costs R145 per bottle, whereas you can buy it at R79 from the farm itself.
They also have craft beers on tap, as well as an extensive cocktail menu, where you can order a Classic Mojito for R55 or a Strawberry Daiquiri for R59.