Ingredients
Method
1.Heat oil in a frying pan on medium. Cook onion for 2-3 minutes, until soft. Add garlic and cook for 30 seconds, until fragrant. Add wine and simmer for 2 minutes, until almost evaporated. Add tomato and sugar and bring to a simmer. Cook for 15 minutes, until thickened slightly.
2.Meanwhile, cook potato in a saucepan of salted boiling water for 10-15 minutes, until tender. Drain and transfer to a bowl. Add butter and milk, and mash until smooth.
3.Add olives and fish to tomato mixture and cook for 5 minutes, until fish is just cooked through. Season to taste.
4.Scatter stew with basil and serve on mash.