Slice and salt your heirloom tomato/tomatoes and place them on paper towels to drain some of their liquid.
Roll out your pizza dough on a lightly floured surface.
Place the pizza crust on your sheet pan lined with parchment paper. Lay the tomato sauce down first. Then add your heirloom tomatoes. Be sure to spread them out. Next add your fresh mozzarella.
Top with fresh basil, olive oil and crushed red pepper. Place the pizza in middle rack of your oven and bake for 15 minutes. The crust should be lightly golden brown. While the pizza is still hot, Generously spoon the pesto all over the pizza. Slice and enjoy!
Pistachio Pesto
Add all the ingredients to a blender. Pulse to combine. Blend for 1-2 minutes until a thick sauce forms.
Notes
If you can't find any heirloom tomatoes, you can use beefsteak tomatoes or even cherry tomatoes.
There will be some pesto left over. You can store the pesto in the fridge for up to a week, or freeze for up to 6 months. This pesto is delicious as a sauce with spaghetti or penne.
Preheat your oven for at least an hour to make sure its really hot before the pizza goes in.
Tomatoes carry a lot of water and it's inevitable that they'll leak a bit while baking. But placing the tomatoes on paper towels and lightly salting them prior to topping your pizza, will remove most of their liquids.