Guindilla peppers, also known as Piparras, are delicious Spanish chilies, often from the Basque Country. But what makes them unique is their medium hot taste with a sweet flavour. They are yellowish-green, long and narrow with a slight curve. The thin green peppers are picked early and packed in white wine vinegar creating a tangy and perfectly spicy treat, which makes them just delicious. They have the heat of something like a banana pepper but they are more delicate and complex.