Fish Cakes with Horseradish Mayonnaise

Ингредиенты

• 1/2 cup (125 ml) mayonnaise
• 1 tbsp (15 ml) prepared horseradish
• 1 tsp (5 ml) Dijon mustard
• 3 cups (510 g) potatoes, peeled and cubed
• 8 garlic cloves, peeled
• 1 cup (95 g) leek, chopped
• ⅓ cup (75 g) butter
• 1 lb (450 g) haddock or cod, cut into pieces
• 3/4 cup (95 g) breadcrumbs
• 1 tbsp (15 ml) olive oil