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Portobello Steaks and Butter Bean Mash

Course: Main Course
Keyword: butter beans, Chilli, portobello mushroom
Servings: 4 people
Author: Yotam Ottolenghi and Ixta Belfrage



  • 8 medium to large portobello mushrooms about 650g, stems removed
  • 10 garlic cloves peeled
  • 1 onion peeled and cut into 6 wedges (150g)
  • tbsp chipotle chilli flakes
  • 1 red chilli 15g
  • 4 tsp cumin seeds roughly crushed in a pestle and mortar
  • 1 tbsp coriander seeds roughly crushed in a pestle and mortar
  • 2 tbsp tomato paste
  • 400 ml olive oil


  • 1 × 700g jar of good quality cooked large butter beans drained (500g) (we use Brindisa Navarrico large butter beans, but you can, of course, use tinned or cook your own)
  • tbsp lemon juice
  • 1 tbsp olive oil
  • flaked sea salt


  • Preheat the oven to 150°C fan.
  • Put all the ingredients for the steaks and 1 tablespoon of flaked salt into a large ovenproof saucepan, for which you have a lid. Arrange the mushrooms so they are domed side up, then top with a piece of parchment paper, pushing it down to cover all the ingredients. Cover with the lid, then transfer to the oven for 1 hour. Turn the mushrooms over, replacing the paper and lid, and return to the oven for 20 minutes more, or until the mushrooms are very tender but not falling apart. Use a pair of tongs to transfer the mushrooms to a chopping board, then cut them in half and set aside.
  • Use a spoon to remove the onion, garlic and chilli (discarding the stem) – don’t worry if you scoop up some of the spices and oil. Put them into the small bowl of a food processor and blitz until smooth. Return the blitzed onion mixture to the saucepan, along with the mushroom halves, and place on a medium-high heat. Cook for about 5 minutes, for all the flavours to come together.
  • While the mushrooms are cooking, make the mash by putting the beans into a food processor along with the lemon juice, olive oil, ½ teaspoon flaked salt and 2 tablespoons of water. Blitz until completely smooth. Transfer to a medium saucepan and cook on a medium-high heat for about 3 minutes, stirring, until warmed through.
  • To serve, divide the butter bean mash between four plates. Top with four mushroom halves per plate and spoon over a generous amount of the oil and its accompanying aromatics (you won’t need all of it, though – see intro).