Tomato based curry sauce with cashews, spices and butter
In a wide casserole dish, add the chopped onions to around half a cup of mild olive oil (or vegetable oil) on medium high heat for the first 5-10 minutes then sauté on low heat for half an hour until golden
Add the chopped tomatoes, 1 teaspoon of tomato concentrate and ground cashews to the onions and cook down for another 15 minutes. Then blitz with a hand blender until smooth
If you are using prawns (shrimp), drop them in the sauce 5 minutes before the end to warm through until cooked
If you are using chicken, shallow fry chicken cubes in a separate pan using a smaller fraction of the same spices to marinade, and add to the curry to finish cooking
Garnish with chopped cilantro and flaked almonds