question: What is a good beer pairing for Grilled portabello mushroom burger?
answer: A great choice for Grilled portabello mushroom burger is Rabiator (Imperial Wheat Beer). Here's the recipe:
  A Imperial Wheat Beer with 10.27% ABV. Uses 3 malts and 2 hop varieties. Brewing tip: If you are struggling to get that authentic head retention increase your mash temperature to about 70°C.