Fill a large pot with two to three inches of water; cover and bring to a boil while you prepare the snow peas.
Snap one end of each pea and pull the string off with the end.
Add the salt to the water and add the snow peas. Return the pot to a boil and cook the peas for one to two minutes–just until they are bright green but still snap when you break one in half. They should be tender-crisp.
Drain the snow peas and transfer them to a large bowl, toss them with the oil, sliced onion, mint, lemon zest and juice.
Serve immediately.*
Notes
*If you’d like to prepare this dish in advance, cool the peas in ice water immediately after blanching them. Toss them with the oil, onion, mint and lemon zest but reserve the lemon juice until just before serving to keep the color bright green. Reheat them or serve cold.