Vegan Pulled "Pork" Mushroom Sandwich

Big Mama’s Homemade BBQ Sauce (page 161) or store bought ((480 ml))

shiitake mushrooms ((624 g))

baby Portobello mushrooms ((624 g))

extra-virgin olive oil ((15 ml, see note for oil free))

large white or yellow onion (, finely diced)

Salt and pepper (, to taste)

hamburger buns

Arugula

Tomato slices

Sliced dill pickles