How to Make It
Bring a large saucepan of salted water to a boil. Add the sugar snap peas and cook until crisp-tender, about 2 minutes. With a slotted spoon, transfer the sugar snap peas to a large plate and let cool until warm. Add the shelled peas to the boiling water and cook until tender, about 3 minutes. Drain.
Heat the oil in the saucepan. Add the fennel, cover and cook over moderate heat, stirring a few times, until slightly softened, about 4 minutes. Add all of the peas and stir until warmed through. Remove from the heat. Stir in the butter and season with salt and pepper. Stir in the chives and serve.