Horseradish dressing gives this herbaceous beetroot salad the x-factor. From Ruth Pretty’s make-ahead Christmas lunch menu.  Recipe: Ruth Pretty Photo: Carolyn Robertson INGREDIENTS  1.5kg medium beetroot, ends trimmed 1 bay leaf 1 sprig thyme 1 sprig sage 1 tablespoon white wine vinegar 1 tablespoon sugar ½ teaspoon salt Salt and pepper to taste 12 stoned green olives 12 stoned … Continue reading Recipe: Beetroot Salad with Horseradish Dressing