Preheat the oven to Gas 3, 170°C, fan 150°C.
Place tomatoes cut side up onto a roasting tray, drizzle with 1tbsp oil and 2tsp of vinegar. Season and roast until softened, about 30 minutes.
For the dressing, whisk together the remaining oil, vinegar and garlic.
Pan-fry the bacon until crisp, then mix with watercress, red onion, pine nuts, feta and dressing. Divide the tomatoes between 4 plates and pile the salad on top.
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For top tips on protecting you and your family when preparing raw meat and poultry, visit Food Safety in the Home and view the full Food safety at home video.