Add the walnuts to the mixer and mix them alone first for a little bit. Then add the sun-dried tomatoes, the basil, the olive oil and the parmesan. Start mixing and add olive and a tiny bit of water if needed.
When the mixture is a smooth(ish) consistency remove from the mixer into a bowl and add the ricotta. Mix it together until it's mixed together with the pesto. I don't like to add the ricotta to the mixer directly as the speed of the blade warms the cheese.
If you are using it with pasta, make the pasta as per usual and drain it al dente. Put the pasta back in the pot and add the pesto and mix together. It doesn't need to be warmed as the pasta is piping hot.
