Pre‑marinated teriyaki sirloin is already coated in teriyaki sauce/seasoning when sold and is labeled to be fully cooked before eating.
Stovetop directions generally list about 12–15 minutes; one listing specifically notes the strips are ready in 15 minutes.
Listings recommend cooking teriyaki sirloin to an internal temperature of 165°F, measured with a food thermometer.
Listings suggest cooking teriyaki sirloin on the stovetop, grill, oven, slow cooker, or smoker.
Listings identify the cut as loin and specify the items are boneless.
Common serving suggestions include rice, sautéed vegetables (e.g., mushrooms, broccoli), seasoned rice, salads (such as blue cheese salad), and potatoes.