Piquillos are primarily grown in the Navarra region in Northern Spain, but are canned and shipped all over the world. They're surprisingly easy to find in the gourmet food section of most grocery stores. Look on the label for the Seal of Authenticity or Denomination of Origin, both of which indicate that the peppers were grown and produced in Northern Spain.
Piquillos can be used for many things from soups to sandwiches, but I think they have the most appeal when stuffed. Their flesh is meaty and holds up well under canning. So long as you handle them gently, it's easy to stuff these bite-sized peppers with goat cheese, crab salad, a spoonful of spiced grains, or whatever your heart desires.
Here are a few recipes to get your creative gears turning:
Have you ever made anything with these peppers?