Beef Bottom Sirloin

Beef Bottom Sirloin: Nutrition, History and Cooking Guide

Beef bottom sirloin is the lower section of the sirloin primal, sitting just below the top sirloin where the sirloin meets the round and the flank. It is a larger, less uniformly tender section than the top sirloin and contains several distinct muscles including the tri-tip, the ball tip, and the flap meat (known as bavette in France and sirloin flap in North America). The tri-tip — a triangular muscle from this section — became particularly popular in California from the 1950s onwards, where it developed a dedicated barbecue tradition around it: the Santa Maria-style barbecue, cooked over red oak with a simple seasoning of salt, pepper, and garlic. The tri-tip has since spread in popularity across the United States and internationally as chefs and home cooks have recognised its excellent flavour and versatility.

Nutritional Value of Beef Bottom Sirloin

Beef bottom sirloin provides 165 kcal and 20.6 g of protein per 100 g, with 8.6 g of fat of which 3.1 g is saturated — a lean-to-moderate profile with good protein content. It delivers complete protein, B12, zinc, haem iron, and niacin.

Health Benefits

Bottom sirloin is a lean, nutritious cut offering good protein at moderate fat. Its haem iron and B12 provide the key nutritional advantages of red meat. The tri-tip specifically is one of the more nutritionally efficient steak cuts per calorie. Moderate red meat consumption within a varied diet is the standard guidance.

How to Select and Store

Tri-tip steaks and roasts should be firm, deep red, and well-trimmed. The triangular shape means the ends cook faster than the centre — monitor internal temperature across different thicknesses. Refrigerate for up to four days; freeze for up to four months.

How to Cook Bottom Sirloin

The tri-tip is best cooked using a two-zone method: indirect heat to an internal temperature of 50°C, then a hard sear over direct flame for a perfect crust without overcooking. Alternatively, reverse-sear in a 120°C oven then sear in a very hot pan. The tri-tip has grain running in two directions from its point — observe the grain carefully and slice perpendicular to it from the point outward. Bavette suits marinating and quick grilling, always sliced thinly against the grain.