Load the Blender: Drop the whole tomatoes, Rotel, chopped onion, sliced jalapeño, minced garlic, sugar, salt, cumin, lime juice, and cilantro directly into the bowl of a large food processor or a high-powered blender.
Pulse: Secure the lid and use the Pulse setting. Give the machine roughly 10–15 short pulses. Keep a close eye on the texture; you want to break down the whole tomatoes without liquefying the chunks.
Adjust: Remove the lid, grab a chip, and taste. If the tomatoes are particularly acidic, add a tiny pinch more sugar or salt to balance the profile.
Chill: Transfer the salsa to a jar or airtight container. Cover and refrigerate for at least 1 hour. This rest period is essential, as it lets the sharp raw garlic and onion mellow out into the tomato juices.
Serve: Give it a quick stir and serve chilled alongside a mountain of salty tortilla chips or spooned over fresh nachos.