Name: Blue potatoes au gratin
Prep time: 10 min
Cook time: 65 min
Yield: 6
Cuisine: French
Ingredients: 1.1kg blue potatoes, peeled, sliced 0.5cm thick; 2 garlic cloves, minced; 30g butter; 20g plain flour; 475ml double cream; 110g grated Gruyere cheese; 50g crumbled blue cheese; Salt and freshly ground black pepper