In a large heavy skillet heat the oil over moderately high heat until it is hot but not smoking and in it sauté the crab cakes in batches, turning them once, for 3 to 4 minutes on each side, or until they are golden, transferring them as they are cooked to paper towels to drain. Keep the crab cakes warm on another baking sheet in a 200°F. oven. Serve the crab cakes with the tarragon tartar sauce and the lemon wedges.