Spread olive oil on a large roasting tin and place the bacon in the centre. Arrange the potatoes, carrots, apples and red onions around them. Season generously with salt and pepper, and tuck the thyme sprigs among the vegetables. Brush a thin layer of Dijon mustard over the bacon.
Roast for 25–30 minutes (depending on the thickness of the meat). Half way through baking, pour the apple juice over the tin and drizzle the honey over the apple wedges to caramelise them.
To serve, place the roasted vegetables, apples, onions and juices from the pan over the bacon.