The Portobello Mushrooms Cook-Program uses the June Food Thermometer to ensure your mushrooms are perfectly cooked, regardless of size. Removing the stem and gills before roasting is up to you--both are edible, but sometimes the stems can be tough and the gills may taste muddy. Roasted portobellos are delicious in grain bowls, salads and pasta, and they make great burgers. Some folks even use roasted portobellos as paleo burger buns or English muffin bases--try them this way the next time you make June’s Hamburgers or Eggs Benedict!