Pan-Seared Grass-Fed Beef Burger with Caramelized Onions and Toasted Whole-Wheat Bun

Slice the onion into thin half-moons. Heat a small skillet over medium-low heat with half the olive oil. Add the onions, stirring occasionally until they are deeply golden, soft, and sweet, about 15 minutes. Set aside.

Shape the ground beef into a 1-inch thick patty, indenting the center slightly with your thumb to ensure even cooking. Season generously with salt and pepper.

Wipe the skillet clean, increase heat to medium-high, and add the remaining oil. Once the pan is shimmering, add the patty. Sear for 4-5 minutes per side for a perfect medium-well finish, until a crust forms.

Meanwhile, toast the whole-wheat bread.

Briefly wilt the spinach in the hot skillet juices for 30 seconds until just bright green and tender.

Assemble the burger: Place the patty on the toasted bread, pile high with the caramelized onions, and serve the wilted spinach alongside to complete the plate.