Boil the pasta al dente according to package directions on the stovetop - mine was ready in 7 minutes! If you didn't save any water from boiling the beets, save about ¼ cup of the pasta water and set aside.
While the pasta boils, add the prepared beets, ricotta, milk, garlic, and walnuts to your food processor or blender and blend until smooth. You can add in a bit of extra milk if needed.
Add in the cheeses and seasonings, blending until smooth. If the sauce still needs a bit of thinning, you can add the ¼ cup in small amounts until it reaches your desired consistency. The sauce should be easily pourable out of the blender.
Drain your pasta, add it back to your saucepan, and pour the sauce directly into the pasta. Stir gently until the sauce fully covers the pasta.
Transfer the pasta to a serving dish of your choice. Place the burrata sparingly on top of the pasta; you can either cut open the burrata and spoon out the creamy insides, or rip the ball itself and place each handful directly onto the pasta.
Top with a bit more pepper and another sprinkle of walnuts, serve, and enjoy!