Sweet Potato Fritters with Sour Cream

+ ¼ pounds sweet potatoes, peeled and cut into large chunks

soy sauce

scant ¾ cup all-purpose flour

salt + a few dashes fresh black pepper

green onions, chopped

ground cayenne pepper

olive oil, for pan-frying

Greek yogurt

sour cream

extra-virgin olive oil

fresh-squeezed lemon juice

fresh chopped cilantro or parsley, chopped