Bring a saucepan of water to a rolling boil. Add the peas and boil for about 2-3 minutes, until the peas are bright green and tender. Drain, run with cool water to stop the cooking, and set aside.
Melt the butter in a small skillet, then add the peas and mint. Cook for a minute or two until warmed through and coated with the minty buttery sauce. Season generously with salt and pepper and serve right away.