Shred the cabbage and place in a medium bowl
In a small saucepan, combine the water, vinegar and sugar and bring just to boil, stirring to dissolve the sugar.
Pour the liquid over the cabbage and let rest for at least 10 minutes, stirring occasionally.
Combine mushrooms, ground chuck, shallots, salt and pepper in a large bowl. Mix well. Use your hands. Don't be afraid to get dirty. Cooking is the most fun when it's messy.
Form 4 equal patties, pressing your thumb into the center of each, making a small indentation. This helps to keep the meat from puffing up while cooking.
Cook using preferred method (grill or skillet) to desired degree of doneness.
In a small bowl, mix the mayo, Sriracha, and lime juice, adding more Sriracha to taste.
Lightly toast the buns
Divide the slaw and place on the bottom of each bun, topping with a patty and as much of the mayo as desired.
This is a messy, get your fingers dirty and lick off the mess burger. Be sure to have plenty of napkins handy.
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