Shape the spinach mixture into patties 7.5cm (3 inches) long and 4cm (1-1/2 inches) wide, with tapered ends. Dredge the patties in flour and lightly pat off the excess. In a large skillet, heat a thin layer of oil over medium heat. Fry the patties, turning, until golden brown, about 3 minutes per side. Drain on paper towels. Serve warm, accompanied with lemon wedges.