Open the can of tuna. Drain the water out of the can by pushing the lid down into the tuna. Press firmly and tilt the can over the sink until all of the water is drained out.
Add the tuna into a medium to large bowl. Dice the onions very finely and add them to the bowl. Next, add the sweet pickle relish.
Cut the jalapeno lengthwise and remove the seeds and membrane (white stringy part). If more heat is desired, leave the seeds and membrane in tact.
Dice the jalapeno very finely and add them to the bowl. Next add the mayonnaise, mustard, black pepper, ground cumin, and salt. Add more mayonnaise if a more "wet" and creamier texture is desired.
Stir all the ingredients together until everything is fully incorporated. Serve immediately or cover with a lid or plastic wrap, and refrigerate up to 3 days.
Serving Options
As pictured here, you can serve the tuna salad in a "pickle boat." It is a delicious, low-carb, keto friendly option.
Simply cut the large pickle in half lengthwise. Remove some of the flesh by scooping it out with a spoon. Add the tuna salad directly into the hollow you created.
Garnish with additional jalapeno and/or chopped cilantro if desired.