Take out the meat ahead of time to bring it to room temperature.
Set your oven to 200 °C (390 °F)
Grate the ginger and juice the lime.
Cut your spring onion once lengthwise and then in smaller pieces.
Mix the mince with the soy sauce, ginger, lime and spring onions.
Make 4 patties out of the mince mixture, 100g each.
Put the patties on a parchment paper and a cookie sheet.
Cook for 10 minutes, turn patties after five minutes (not absolutely necessary if you’re short on time or have a big batch of hamburgers to make).
If you prefer a grilled texture, put under broil for an additional two minutes.
Mix the mayonnaise with the wasabi to make the wasabi mayonnaise. Taste and add more wasabi if necessary.
Roast the brioche buns in a dry frying pan until golden.
Spread wasabi mayonnaise on one side of the brioche buns, add the hamburger and any other toppings you like.
Serve with potato wedges or chips.