Ridged grill pan: ridge temperature versus valley temperature on a 28 mm sirloin

01Abstract

A 28 mm sirloin was seared in a ridged cast-iron grill pan preheated 7 minutes to 415 °F at the ridge crests and 390 °F in the valleys. A 90-degree rotation at 55 s produced the crosshatch, then a flip and a second rotation. Crust coverage was measured by photographing the steak on graph paper and counting browned squares: 41 percent of the surface was browned, against 92 percent for the same steak in a flat 10 in skillet at the same temperature.

02Variables

Hypothesis A ridged pan contacts only about a third of the steak surface, so it needs a longer preheat and a higher dial than a flat pan to reach the same crust.

03Process

1. Preheat the empty ridged pan 7 minutes, then measure both the ridge crest and the valley with the infrared gun; the two numbers differ by 20 to 25 °F.
2. Brush 1 tsp rice bran oil along the ridges with a silicone brush; do not pour oil into the valleys, it will pool and smoke.
3. Lay the steak on the ridges at a slight angle and do not move it for 55 seconds.
4. Rotate it 90 degrees in place (not a flip) and hold another 55 seconds to build the crosshatch, then flip and repeat.
5. Pull at 4 min 10 s total, rest 5 minutes, and count the browned surface before slicing.

04Observations

• The ridge crests measured 415 °F and the valleys 390 °F after the same 7 minutes; the valleys are further from the burner and shielded by the ridges.
• Contact happens only on the 6 mm crest lines: the steak needed 110 s to show colour versus 60 s in a flat pan at the same dial.
• Without the 90-degree rotation the marks were continuous stripes 6 mm wide with pale bands between them, and the crust coverage was 27 percent.
• Fat rendered onto the ridges ran down into the valleys and smoked from 90 s onward, because the valleys stay above 380 °F and hold a pool of fat.
• Cleanup was the worst part: the valley corners trapped a hard, polymerised film that a nylon brush could not lift.

05Conclusion

A ridged pan gives marks, not crust. If what you want is browning, use a flat pan; if you want the marks for a specific dish, accept that you will brown roughly 41 percent of the surface and that the valleys will collect fat and smoke. Two things help: rotate 90 degrees at 55 seconds rather than flipping early, and pour the fat out of the valleys halfway through with a spoon.