Sweet Potato Falafels

Name: Sweet Potato Falafels
Ingredients: ½ a tin of chickpeas, drained; 125 g podded broad beans, or more chickpeas; 5 cloves of garlic, crushed; 5 spring onions, finely chopped; 2 tsp. ground cumin; 1 tsp. ground coriander; ½ tsp. ground cinnamon; ½ tsp. allspice; ½ tsp. cayenne pepper; A thumb of ginger, grated; A generous handful of fresh coriander, finely chopped; A generous handful of flat leaf parsley, finely chopped; A small bunch of mint, finely chopped; 1 level tsp. baking powder; The zest and juice of 1 lemon; 1 tsp. salt; A generous grind of black pepper; 2 tbsp. gram flour; 125 g peeled sweet potato, finely grated; Sunflower oil, for frying