How to Make It
Bring a large pot of salted water to a boil. Add the peas and beans and cook until crisp-tender, 3 to 4 minutes. Drain.
Heat the oil and butter in a large skillet over medium heat. Add the peas, beans, salt, pepper, and lemon juice and cook until heated through, about 2 minutes. Remove from heat, add the mint, and toss well.