Tartiflette with bacon fat salad Archive

Ingredients

• 1.5kg/3lb 5oz medium sized, red-skinned potatoes, such as Désirée
• 75g/3oz butter, plus extra to serve
• 1 large white onion, finely sliced
• 1 tsp fresh thyme leaves
• 1 bulb garlic, cut in half horizontally
• 10 thick slices smoked dry-cured streaky bacon
• 1 x 250g/9oz whole petit Reblochon cheese, rind removed
• 1 tsp Dijon mustard
• 1½ tbsp white wine vinegar
• 1 free-range egg yolk
• 2 tbsp vegetable oil
• 100g/3½oz mixed salad leaves
• salt and freshly ground black pepper