Heat olive oil in a large cast iron or heavy skillet over high heat. Add snap peas and cook, untouched to char, 2-3 minutes. Stir and cook until the snap peas are tender-crisp but still green, another 2 to 3 minutes, stirring.
Add the garlic, season with salt and pepper and cook 1 minute more.
Transfer to a shallow dish and top with lemon, zest and feta.