Roast chicken, kumquats, black garlic, kale and avocado

Black garlic is a delicious fermented garlic that adds a lovely treacle–caramel flavour and depth to dishes without a strong raw-garlic after-taste. It is becoming easier to find, but if you have no luck, you can use regular garlic. Kumquats are great here, too, adding a slight bitterness because you use them unpeeled; if unavailable, substitute thinly sliced lemon, mandarins or oranges. Avocado oil works well in any dish that contains avocado. It has a high burning point, which means it is