Recipe on the official website

Foods that contain omega-3 fats have been found to help reduce the inflammation associated with some forms of arthritis, such as rheumatoid arthritis. These effects are modest compared with medication, but they don’t have side effects, and may also have other health benefits, such as reduced risk of heart disease.

Foods rich in omega-3 fats include:

oily fish such as salmon and sardines
linseeds and linseed (flaxseed) oil
canola (rapeseed) oil
foods fortified with omega-3, such as margarines and eggs
some fish oil supplements.
Don’t confuse fish oils with fish liver oils (such as cod liver oil and halibut liver oil). Fish liver oils also contain vitamin A. Large amounts of vitamin A can cause serious side effects. Ask your doctor before taking any supplements, to make sure you’re taking the correct dosage.