Bebi Ester’s Georgian Chicken with Walnut Sauce and Polenta

Name: Bebi Ester’s Georgian Chicken with Walnut Sauce and Polenta
Yield: Feeds 4-6
Ingredients: 1 small onion, diced; 1 tsp chilli flakes; 1 tsp salt; 1 tsp white pepper; 2 tbsp rapeseed oil; 600 ml (2½ cups) chicken or vegetable stock; 400 g (3⅓ cups) walnuts; 6 chicken thighs; 1 tbsp curry powder; 300 g (scant 2 cups) quick polenta; 1 tsp rapeseed oil; 4 cloves garlic