Soak the chickpeas for around 8 hours in cold water. Then drain them and rinse well and set aside.
200 g dried chickpeas
Put the soaked chickpeas, spices and seasoning in a large bowl.
200 g dried chickpeas, 1 tsp ground coriander, 1 tsp ground cumin, 1 tsp chilli powder, Salt and pepper
Use a hand blender to blend the chickpeas.
My tip - I found that the mixture was too thick for my hand blender to handle, so would suggest using a food processor if you have one, as my hand blender nearly burnt out!
Add the sweet potato and blend again.
150 g mashed pumpkin or sweet potato
Add half the flour and mix well. Add the other tablespoon and stir until combined. The batter will be firm, and not sticky.
2 tbsp plain flour (all-purpose flour)
Chill it for at least 30 minutes. Line the slow cooker pot with baking paper or a liner.
Scoop out spoons of the batter with a dessertspoon (the recipe suggests teaspoon size but I found this too small) and roll into balls. Place each falafel in the lined slow cooker with a little space between them. The recipe suggests making a second layer with more baking paper if needed - I tried this but found that the top layer of falafel were steaming rather than browning like the others, so I placed all my falafel in the pot.
Place the lid on the slow cooker and cook the falafel on low for eight hours or on high for around 4-6 hours (the recipe suggested 6 hours on high but I think as I used a large slow cooker, 5.7 litre, mine would have been burnt by then).
I found I needed to occasionally turn my falafel to ensure they were crispy on all sides and did not catch. After around four hours on high I had wonderful crispy falafel with a soft centre.