In a blender or food processor, puree chopped tomatoes, soaked dates, vinegar, Dijon mustard, garlic powder, and onion powder until smooth.
Transfer the pureed mixture to a saucepan and place over medium heat.
Bring to a simmer and then reduce heat to low, let simmer until the sauce has thickened, about 10-15 minutes.
Season with salt and pepper to taste.
Serve immediately or store in an airtight jar in the refrigerator for up to 5 days.