Cook pasta according to package directions, but don't drain immediately.
375 g penne pasta
Meanwhile, heat olive oil in a frying pan over medium heat then add cherry tomatoes.
2 tablespoon olive oil, 500 g cherry tomatoes
Fry tomatoes until they start to break down, allowing their juices to release and brown (not burn) in the base of the pan.
While the pan is still on the heat, add ½ cup (or more if needed) of the pasta cooking water to the pan with tomatoes to deglaze the base - it will sizzle a little.
pasta cooking water
Using a slotted spoon, remove the cooked pasta from the pot (don't drain the water) and add it to the tomatoes, stirring to coat.
Transfer pasta to a mixing bowl or serving bowl, then stir in basil pesto to coat. Add a little more pasta water to loosen if needed.
4 tablespoon basil pesto, pasta cooking water
Serve with fresh parmesan cheese.
fresh parmesan to serve