Roasted potato salad with blue cheese dressing Recipe | Food Network UK

Ingredients

• 2 1/2kg red and white table potatoes, cut into 2 1/2cm pieces
• 3 tbsps olive oil
• 2 tsps minced garlic
• 1 1/2 tsps salt, divided
• 3/4 tsp ground black pepper, divided
• 60g butter
• 1 large onion, chopped
• 1 tbsp balsamic vinegar
• Blue cheese dressing, recipe follows
• 180ml mayonnaise
• 1 (150g) container blue cheese, crumbled
• 2 tbsps sour cream
• 1/2 tsp ground black pepper
• 1 1/2 tsps prepared horseradish