Pear, walnut & blue cheese tart - Good Food Middle East

Ingredients

• 50g walnut halves
• 150g plain flour
• 80g cold unsalted butter, chopped
• 1 egg yolk
• 1 tbsp butter
• 1 tbsp olive oil, plus an extra 1-2 tsp
• 4 shallots, sliced into half-moons
• small bunch of sage, finely chopped
• 200g chard, stalks finely chopped and leaves roughly chopped
• 2 pears, halved, cored and sliced
• 3 large eggs
• grating of nutmeg
• 150g crème fraîche
• 150g gorgonzola dolce or vegetarian alternative, torn into bite-sized pieces