Combine beef, sliced green onions and 2 teaspoons miso paste in a large bowl. Divide mixture into 4 and form each into a burger patty about 1/2 inch (1 1/2cm) thick. Rub each patty generously with oil.
Heat a BBQ or frying pan on a high heat. When the pan is very hot sear burgers for 4-5 minutes on each side or well browned and cooked to your liking.
Meanwhile, combine extra 2 teaspoons miso with the mayonnaise. Divide miso mayo between two plates smearing in an off-center circle.
When the burgers are cooked place two burgers on each plate on top of your pool of mayo.
Return the pan to the heat and cook spinach or greens, stirring often until just wilted. Divide cooked greens between two plates. Top with seeds and enjoy!