In a blender or food processor, add in the blueberries, chickpeas and rosemary.
For a smooth stage 2 puree, puree on high for 1-2 minutes or until completely smooth, adding in 1 tbsp of water at a time to achieve this consistency.
For a chunky stage 3 puree, pulse for 10 seconds at a time, scraping down sides every 30 seconds and stopping when you have desired consistency, adding in 1 tbsp of water at a time to achieve this consistency.