Add the basil to a food processor along with the pine nuts, garlic, and salt then pulse 5-6 times until roughly chopped. Remove the lid and scrape down the sides.
Close the lid then turn the food processor on and, with the machine running, drizzle the oil in through the feed tube. Blend until the mixture is well combined and emulsified, stopping to scrape the sides if needed. Be careful not to overmix, you want the pesto to have some texture.
Add the Parmesan cheese and pulse 2-3 times to combine.