In a large bowl, mix together all ingredients except oil. Add a pinch of salt, to taste. Pulse mixture in a food processor for a few seconds to blend; do not purée (leave some texture).

Generously coat a large skillet or griddle with oil and place over medium-high heat. Using your hands, mold buckwheat mixture into six patties. Placein skillet, leaving at least 1 inch between them (cook in batches if needed). Let cook, undisturbed, for 5 minutes or until well-browned on one side. Using a wide spatula, gently flip burgers and cook the other side for 4 minutes or until browned. Serve burgers hot.