Remove the vegetables as they turn black. Transfer the toasted vegetables to a blender or food processor.
Toast the pumpkin seeds in the same pan over medium high heat. The seeds will start to pop. Continue toasting until the seeds are light golden brown (about 2 minutes). Transfer the seeds to the blender.
Add the remaining ingredients to the blender and process until creamy and fairly smooth. Adjust seasoning with salt and pepper.
Serve the sauce over chicken, fish or grilled vegetables.
Tips
The sauce can be made and stored, covered, in the refrigerator for 3 days or frozen for 1 month.