Black Bean and Corn Veggie Burger with Sweet Potato "Bun"

  • Preparation Time10 mins
  • Cooking Time35 mins
  • Serves4
  • DifficultyMedium
2 large, fat sweet potatoes (about 1 1/2 pounds), peeled and cut into eight 1/2-inch rounds
3 tablespoons olive oil, plus more for oiling the grill grates
One 15-ounce can black beans, rinsed
1/2 cup frozen corn, thawed
1/3 cup finely diced pepper jack cheese
5 tablespoons cornmeal
1 large egg white
2 spring onions, thinly sliced
2 tablespoons light mayonnaise
4 lettuce leaves

Preheat the oven to 220°C. Prepare a grill for medium-high heat. Brush the sweet potatoes with 1 tablespoon of the oil, and sprinkle with a large pinch of salt. Lightly oil the grill grates. Arrange the sweet potato rounds on the grill, cover with the lid and cook until there are nice grill marks and the potatoes are tender but not mushy, 8 to 12 minutes per side. Set aside to cool completely. (These 'buns' can be refrigerated in an airtight container up to 2 days.)

Meanwhile, mash the beans and corn in a medium bowl until the beans form almost a paste. Add the cheese, 3 tablespoons of the cornmeal, the egg white, spring onions and 3/4 teaspoon salt. Form the mixture into 4 patties about 1/2 inch thick. Refrigerate for at least 20 minutes up to overnight.

Heat the remaining 2 tablespoons oil in a large ovenproof nonstick skillet over medium heat. Put the remaining 2 tablespoons cornmeal onto a plate. Dredge both sides of the patties in the cornmeal. Cook until golden brown, 3 to 4 minutes per side. Transfer the skillet to the oven, and bake until the burgers reach an internal temperature of 75°C, about 5 minutes.

Brush 4 of the grilled sweet potato slices with some of the mayonnaise. Put the lettuce leaves and burgers on the remaining 4 slices, and sandwich together.

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