Fragrant Jamaican Chicken and Vegetable Curry
2 tablespoons mild curry powder2 teaspoons ground allspice1 tablespoon brown sugar½-1½ teaspoons hot chilli powder (or more, for a spicier version)½ teaspoon ground turmeric800 grams skinless, boneless Rangitikei chicken thighs2 teaspoons sea salt2 tablespoons olive oil1 tablespoon butter1 large onion, thinly sliced3 cloves garlic, crushed2 tablespoons grated fresh ginger4 sprigs thyme3 bay leaves1½ cups chicken stock1½ cups coconut cream2 tablespoons soy sauce8 smallish red potatoes, halved2 medium carrots, sliced on the diagonal2 jalapeno chillies