Drain the canned tomatoes, discarding the juice.

Rinse the diced red onion under cold water to reduce its sharpness.

In a bowl, combine the drained tomatoes, rinsed red onion, diced serrano pepper, garlic powder, cumin powder, salt, sugar, oil, and apple cider vinegar.

Mix all ingredients thoroughly until well combined.

Cover the bowl and chill in the refrigerator for at least 45 minutes to allow the flavors to meld together.