Shishito peppers are a frying/grilling pepper from Japan. They're harvested green, and they're not at all hot (at least... 99% of the time; very rarely there's an odd hot one). They’re best quickly blistered and then eaten hot.
in an unsealed bag in the fridge. Make sure you store them dry. Eat within a week, though they may keep for longer.
Here's what Deborah Madison says to do with them: "Heat a little olive oil in a wide sauté pan until it is good and hot but not smoking. Add the peppers and cook them over medium, tossing and turning them frequently until they blister. They shouldn't char except in places. Don't rush. It takes 10 to 15 minutes to cook a panful of peppers. When they're done, toss them with coarse sea salt and add a squeeze of fresh lemon. Slide the peppers into a bowl and serve them hot. You pick them up by the stem end and eat the whole thing, minus the stem, that is." They're wonderful. I’ve also heard they’re good pickled, but I’ve never tried because they’re so good blistered.