Bilbao almonds), rice cakes and "bollos de mantequilla" (butter buns). Bilbao, as other Basque cities, is known for a variety of appetizers and snacks, being prominent among them the "pintxos", which are typically eaten in bars and that consist of small slices of bread on top of which is placed an ingredient or mixture of ingredients, generally of many different types and usually including elements typical of Basque cuisine. Other snacks include "rabas" (fried or battered calamari rings, usually served with lemon slices), Spanish omelette (omelette made with eggs and potatoes, sometimes including onions and peppers), "txampis" (stuffed mushrooms), "triángulos" (Bilbao-style
Active ingredient Active ingredient An active ingredient (AI) is the ingredient in a pharmaceutical drug or pesticide that is biologically active. The similar terms active pharmaceutical ingredient (API) and bulk active are also used in medicine, and the term active substance may be used for natural products. Some medication products may contain more than one active ingredient. The traditional word for the API is pharmacon or pharmakon (from , adapted from pharmacos) which originally denoted a magical substance or drug. The terms active constituent or active principle are often chosen when referring to the active substance of interest in a plant (such