Portobello och blåostsmörgåsar

👩‍🍳 Gör så här

1. 1
   Heat oven to 220C/200C fan/gas 7. Mix the onion with the oil and vinegar, spread on a baking tray, then put the mushrooms on top, stem-side up, and scatter over the thyme and some seasoning. Cook in the oven for 15 mins, until starting to soften and caramelise.
2. 2
   Crumble the cheese into the cavity of the mushrooms and cook for 5 mins more until the cheese is melted and bubbling.
3. 3
   Split the ciabatta roll in half and lightly toast. Top with a handful of rocket, the sticky onions and the cheese-topped mushrooms. Serve with oven fries, if you like.