Begin by draining the tuna or salmon and placing it in a large mixing bowl. Take your time to break it up with a fork, ensuring there are no large chunks.
Finely chop the sun-dried tomatoes, celery, and red onion. Aim for uniform pieces so they mix well into the salad.
To the bowl with the tuna, add the chopped sun-dried tomatoes, celery, and red onion. Stir gently until everything is evenly distributed.
Spoon in the hummus and add 1 tablespoon of the stone ground mustard. Mix well, ensuring the tuna and veggies are fully coated. Taste and adjust the mustard according to your preference.
Fold in the fresh dill and season with sea salt and black pepper to taste. Give it one last gentle mix.
You can enjoy this salad immediately, or if you prefer, refrigerate it for a while to let the flavors meld together. Serve it over a bed of greens, in a wrap, or simply enjoy it on its own.