Rainbow tomato tart

Ingredients

• 1 sheet puff pastry
• 1 egg yolk, plus 1 tbsp milk, mixed for egg wash
• Pesto filling
• 2 handfuls basil leaves
• 1/4 cup pine nuts
• 1/4 cup olive oil
• 100 gram goat's feta
• 75 gram Parmesan cheese, grated
• 1 tablespoon balsamic vinegar
• 1/2 teaspoon sea salt and freshly ground black pepper
• Topping
• 3 cup Countdown cherry tomatoes, halved
• sea salt and ground pepper, to season
• fresh basil leaves, to garnish