Prep the grill. Whether using a stovetop or grill, heat to about 350 F. Sear burgers for about 3-4 minutes on each side or until cooked to your desired doneness.
Serve. Prep the buns by brushing generously with oil and adding the grill or pan for a few minutes. Assemble the burgers starting with a bit of the harissa mayo on the bottom bun, then the burger, and top it off with some greens and the top bun.