Heat the oven to 200 degrees C. Pop the washed and pricked sweet potatoes into the oven and bake until soft, about 30 - 40 minutes. Or for speed, pop into a microwave, cook for 12 minutes on high and then finish in the hot oven for 15 mins.

While the beans and chickpeas are simmering, prep the onion, pepper, garlic and spices. I like to put my spices, seasoning and herbs onto a small plate and then blend together

While the onions and pepper cook, remove the cooked sweet potatoes from the oven, cut through and leave to cool slightly. Peel off the skin and mash lightly with a fork. Season. Turn the oven down to 180 degrees C.

Drain the beans and chickpeas and pulse gently in a food processor. It's important not to over process and to have some texture. If you don't have a food processor, mash with a fork or potato masher or chop roughly with a knife. Then thoroughly mix the beans, chickpeas, sweet potato mash and onion mixture together. Taste and adjust seasoning and spicing if required.

Place half a pack of Panko breadcrumbs into a shallow bowl, add the spices and herbs and mix together. Take a large tablespoon of the burger mixture and put it onto the breadcrumb mix. Form into patties an cover with breadcrumbs. Once all of the burgers are formed chill for 30 mins in the 'fridge to firm up a bit. It's not essential to chill if you're in a hurry.