The secret ingredient is... star anise!
For the burgers, in a large bowl, mix the soy sauce, star anise, chili garlic sauce, ginger and 1 tsp. salt. Add the beef and gently mix with your hands until evenly blended. Shape the meat mixture into 4 patties.
In a small bowl, mix the mayonnaise, star anise, chili garlic sauce and ginger; season the mayo with salt.
Heat a grill or a large skillet over medium-high. Cook the burgers to the degree of doneness that you like, about 3 minutes per side for medium-rare. Serve on the buns with a swish of the mayo and the sliced tomato and lettuce.
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