sweet potato and black-bean burgers

Serves: 4

Ingredients:
2 cups grated sweet potato
½ cup  rolled oats
1 can black beans ,drained and  rinsed
½ cup chopped spring onion
¼ cup vegan mayonnaise
1 tablespoon tomato paste
1 teaspoon curry powder
⅛ teaspoon salt
½ cup plain low fat yoghurt
2 tablespoons chopped fresh dill
2 tablespoons lemon juice
2 tablespoons extra-virgin olive oil
4 whole-wheat hamburger buns, toasted
1 cup thinly sliced cucumber

Method:
squeeze grated sweet potato with paper towels to remove excess moisture; place in a large bowl. pulse oats in a food processor until finely ground; add to the bowl with the sweet potatoes. add beans, spring onions, mayonnaise, tomato paste, curry powder and salt to the bowl; mash the mixture together with your hands. shape into four patties. place the patties on a plate; refrigerate for 30 minutes.
stir yoghurt, dill and lemon juice together in a small bowl; set aside.
heat oil in a large pan over medium-high heat. add the patties; cook until golden brown, about 3 minutes per side.
divide the yoghurt sauce evenly among top and bottom bun halves. top each bottom bun half with a burger and cucumber slices; replace top bun halves.