Knead the mixture over and over again, as you would dough until almost paste-like.
Using a biscuit cutter, the same size as the bun you will serve them on, pack the ring tight with the meat mixture then transfer each to a tray.
Heat the pan you will cook on. Add oil and butter and quickly place the burgers in the pan. About 5 minutes on each side, depending on how thick you formed them, and the burgers are ready.
If using a grill, melt the butter and add to the olive oil. Use this to brush across the grill grates.