Potato & Parmesan Gnocchi with Spinach, Gorgonzola and Toasted Walnuts

Ingredients

• 1 kg desiree potatoes
• 2 egg yolks
• 1/4 cup grated parmesan
• salt flakes
• pinch ground nutmeg
• 100 g 'OO' plain flour
• 20 g butter
• 1 large brown onion, peeled and diced
• 2 cloves garlic, peeled and chopped
• 1/2 cup vegetable stock
• 1/2 cup thickened cream
• 100 g gorgonzola dolce*, crumbled
• 100 g baby spinach leaves
• salt flakes and freshly ground black pepper
• 1/3 cup walnuts, toasted
• grated parmesan, to serve