@witch
I didn’t say that you cannot have sirloin tips, I said that sirloin and fillet are not the same thing, and I would expect a better quality of meat if I ordered fillet than if I ordered sirloin. Maybe this definition from the Cooks Thesaurus will help:
http://www.foodsubs.com/MeatBeefLoin.htmlfilet mignon = tenderloin steak = fillet steak = fillet de boeuf = tender steak Pronunciation: fee-lay mee-NYOH Plural: filets mignons Notes: These are cut from the tenderloin, and they're the most tender steaks you can buy, though not the most flavorful. American butchers usually call all tenderloin steaks filets mignons, but the French reserve the name for just the cuts at the small end of the tenderloin, which is the best part. As they move away from the filet mignon, the French call their cuts tournedos, filet steak, châteaubriand, and bifteck. American butchers confuse matters even more by sometimes calling top sirloin steaks châteaubriands. Don't marinate these steaks and don't cook them beyond medium rare. Substitutes: top sirloin steaks (larger) OR Porterhouse steaks
sirloin steak Notes: The sirloin is near the rump, so the meat's a bit tougher than cuts from the loin or the rib. There are several different sirloin steak cuts, named for shape of the hip bone that's left in them. Going from fore to aft, there's the tender but bony pin bone sirloin, which is right next to the Porterhouse on the carcass, the flat bone sirloin, the round bone sirloin, and finally the wedge bone sirloin, which is closest to the rump and therefore least tender. A boneless sirloin steak is sometimes called a rump steak = butt steak. Sirloin steaks are usually grilled or broiled. Don't overcook them or they'll lose much of their flavor. Substitutes: round steak OR top sirloin steak OR flank steak OR T-bone steak OR strip steak OR Porterhouse steak