This is ready to assemble and enjoy! A whole Portobello mushroom marinated and grilled. Served with a couple of slices of Bread SRSLY’s sourdough, gluten free bread, vegan pesto aioli and sliced red onion and red leaf lettuce). Toast bread or alternately heat in skillet with a little hot oil; re-heat ‘shroom in covered skillet over medium heat till hot. Schmear aioli onto bread and assemble all ingredients in logical sandwich order. Enjoy with Rainbow Slaw.