Pan-seared tuna with onions

Thon aux oignons : instructions

• 1
  Peel the onions and slice them into strips. 
• 2
  Dredge the tuna slices in flour, then cook them in oil. 
• 3
  Meanwhile, sauté the onions in another pan, adding some of the oil used to cook the tuna.
• 4
  Once the onions are cooked, drain the oil and add a tbsp of vinegar.
• 5
  Deglaze for one minute over heat and pour over the tuna.