FLIPPING
Lastly, you need to allow the burger to cook without over-flipping. According to Ollier, you can tell it’s ready to flip by certain signals: “You should see the patty’s ‘shoulders’ surrender (i.e. the edges will start to soften and droop), and moisture beads will develop on top.”
And whether you’re going for grill marks or an all-over sear, you want to achieve a rich caramel color, not too dark.