Wash sweet potato and pierce all over with a fork; place in the microwave for 12 to 15 minutes, or until fork tender. Allow to cool then scoop out flesh and place in a medium-sized bowl, fold in the onions, yellow pepper, garlic and ginger, mix thoroughly then add seasoning, herbs, egg and panko. Mix again then form into four equal-sized patties and refrigerate for a minimum of half an hour and up to 1 hour. Remove from refrigerator and roll patties in sesame seeds.
In a frying pan over medium heat, heat vegetable oil and add patties, grill on both sides, about 4 to 5 minutes, until heated through.
To assemble, add your favourite greens to the bottom of a grilled bun then add the burger, top with fresh vegetable salsa.