Ham and Gruyère Cheese Tarte - Inspired Cuisine

Ingredients

• 2 sheets puff pastry
• 1-2 tbsp Dijon mustard
• 1 lb smoked ham
• 8 oz shredded white cheddar or gruyere cheese
• 1/2 lb baby spinach
• 1 egg yolk mixed with a tablespoonful of water
• 1 tbsp all-purpose flour for sprinkling on the rolling surface
• 3 tbsp sherry or white wine vinegar
• 2 tbsp apricot jam
• 1/4 cup olive oil
• kosher salt and freshly ground black pepper
• 1/2 lb baby greens
• 1/4 cup lightly toasted sliced walnuts or almonds (optional)