Boil the beetroot (in a pressure pan) until very tender. (see notes)
Blend it in a mixer with almond butter and salt until it's very smooth. If necessary, add one or two tbsp of water.
Add to your favorite pasta
Notes
In a pressure pan, you will need about 20 minutes. With the normal boiling method it will take about 45. Add 1 TBSP vinegar to the water to enhance the flavor.