Final answer:
The dish with blackened sirloin tips could be a part of regional cuisine from areas where beef is a popular BBQ meat, like parts of Texas, the Great Plains, or California.
Step-by-step explanation:
The dish described in the question with blackened sirloin tips, applewood smoked bleu cheese, and red onion could likely belong to a steakhouse menu or the cuisine of a region where beef is the predominant BBQ meat. The Great Plains, parts of Texas, and California are known for their grazing cattle and subsequent popularity in beef-based dishes. For instance, beef ribs are popular in certain regions, while brisket, rumps or the tri-tip cut, which is often used in California but elsewhere is typically ground for hamburger, have their own regional popularity. In California, tri-tip is a distinctive choice, while in different parts of the U.S, preferences shift towards chicken, turkey, or fish, predominantly due to local availability and cultural practices.