The Costco Steak Phenomenon: Testing Sirloin Tri-Tip Against Filet Mignon

From key trends to fundamental details, understand everything about The Costco Steak Phenomenon: Testing Sirloin Tri-Tip Against Filet Mignon in our latest feature.

To evaluate whether warehouse tri-tip matches the elite dining reputation of filet mignon, we ran controlled, side-by-side trials utilizing USDA Prime tri-tip sourced from Costco and center-cut USDA Choice filet mignon purchased at retail. Both cuts were dry-brined for **12 hours** with 1 percent kosher salt by weight to standardize surface moisture and internal osmotic absorption.

In mechanical tenderness testing, traditionally measured by Warner-Bratzler Shear Force (WBSF), tenderloin reliably leads the commercial market with scores below 3.0 kilograms of shear force. However, blind consumer panels regularly dock tenderloin points for mild, washed-out flavor profiles. Our kitchen evaluations confirmed this divide:

• Texture and Yield: The filet mignon required minimal chewing effort, parting under dull butter-knife pressure. Yet the Prime tri-tip, cooked to an identical medium-rare core, yielded an exceptionally close tenderness profile while releasing noticeably higher volumes of seasoned fat.
• Flavor Density: The tri-tip exhibited an assertive, mineral richness reminiscent of hanger steak or strip loin. The tenderloin tasted neutral by comparison, leaning heavily on surface butter and pan juices for culinary character.
• Intramuscular Marbling: Because Costco selects Prime bottom sirloin grades featuring dense, spiderwebbed fat webbing, the roasted tri-tip retained internal juiciness far better than lean tenderloin medallions.