For the dressing:
2tbsp extra-virgin olive oil 2tsp Dijon mustard 2tsp sugar
1tbsp red wine vinegar
1. Heat the oven 1800C/3500F/gas mark 6.
2. First, make the dressing. Put all the ingredients in a small bowl or jug, season with salt and pepper and whisk vigorously to combine. Set aside while you make the salad.
3. Scatter the celeriac over a large baking tray, then the