Put the can of tomatoes with chilies into a food processor or blender. Add the diced onion, and puree until it is the desired level of chunkiness. (My family likes salsa with minimal chunks, so I puree for about a minute.)

Add in the garlic salt, salt, ground cumin, sugar and lime juice. Puree 15 to 30 seconds longer to mix together.

Move the seasoned mixture into a large bowl.

Next you can either add the crushed tomatoes on top of the mixture as they are or puree them in the food processor or blender first depending on how chunky you like your salsa.

Stir the plain tomatoes and seasoned tomato mixture together.

Serve with your favorite tortilla chips and store any leftover salsa in the fridge.