Combine burger ingredients and shape into 4 burgers. Barbecue or grill until fully cooked - 8-10 mins.
Meanwhile make up the Aubergine Sauce - heat the oil, sauté the shallots, aubergine and pepper until just soft. Add the soy, balsamic vinegar, lemon juice, tomato juice, sugar and basil. Simmer for 4-5 mins. Taste for seasoning.