Seared Tuna With Sweet Balsamic Onions

4 sm tomatoes on the vine possible 100 gm French beans 1 x red pepper quartered and seeded 4 x tuna steaks about 150g each 4 lrg new potatoes boiled and[...]

2 tablespoons olive oil 2 cups onions , sliced 2 teaspoons sugar salt and pepper 1/3 cup red wine vinegar 2 tablespoons balsamic vinegar 24 ounces tuna steaks[...]