Hot Bacon, Roasted Garlic & Watercress Salad

Ingredients

• heads of garlic
• About 20 baby new potatoes, boiled and cooled
• watercress
• bag mixed green salad leaves
• Tablespoons vegetable oil
• thick-cut bacon slices, cut into ¾ inch pieces
• Salt and freshly ground black pepper
• Tablespoons good-quality extra virgin olive oil
• teaspoons Dijon or whole-grain mustard
• of sugar
• Juice of ½ lemon