A delicious healthy midweek supper that is pretty simple to make. The sweet potato makes the falafels lovely and moist and the spices and lemon perk up the chickpea flour. These falafels are so good dipped in the spicy harissa yogurt. You can also try wrapping them in a warmed wholemeal pitta. Harissa is one of my storecupboard staples, and I would urge you to get a few jars – it has a slow-burning chilli heat, balanced with a sweet smokiness that adds a real depth of flavour to any dish. You can dollop harissa on eggs or avocado toast, use it to marinade vegetables, or add it to couscous or grilled halloumi.