Marinated tuna with red onion sauce

ServesServes 4


  • 4 tuna steaks, each about 150g
  • 2 cloves garlic
  • 200ml dry sherry (optional)
  • 4 Spanish onions
  • 75ml olive oil
  • salt and freshly ground black pepper
  • 25ml olive oil
  • ½ lemon, juiced


  1. Place the tuna in a dish and pour over 100ml of the sherry
  2. Peel and finely dice the garlic, add to the tuna and allow to marinate for at least an hour before cooking
  3. Peel and finely slice the red onions
  4. Heat the oil in a large frypan
  5. Add the onions, salt and pepper and cook over a low heat for 20-30 minutes until golden and sweet
  6. Drain the marinade from the tuna and add it to the onions with the rest of the sherry and simmer for 4-5 minutes until sauce consistency
  7. Keep warm
  8. Heat the rest of the olive oil in a large frypan and sear the drained tuna for a minute or two on each side until cooked as desired
  9. Serve the tuna with the sauce poured over the top

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