Combine stewed tomatoes, green chiles, green onions, red onion, salt and pepper in a blender or food processor.
Blend until smooth or desired consistency is reached. Taste and adjust seasoning if needed. Chill before serving.
Notes
Store in an airtight container, such as a quart size mason jar, for up to 2 weeks. If settling occurs, stir together or run it through the blender again.