Whisk together all of your sauce ingredients together in a bowl, taste test, adjust, then set in the fridge until ready to serve.
Line a sheet pan with parchment paper and set aside.
In a medium bowl, break up the tuna chunks.
Add the eggs, sea salt, pepper, mustard, lemon zest, dill, and shredded mozzarella. Stir well to combine.
Spritz or brush your sheet pan with the oil.
Form your mixture into 9 patties and arrange them on your prepared sheet pan.
You may refrigerate the uncooked patties for 30 minutes to overnight, to prepare ahead.
Preheat your oven to 375 degrees f.
Bake the patties for 15 minutes, or until nicely golden.
Alternatively, you can cook them in a skillet.
Heat half of the oil in a large skillet over medium heat and cook half of the patties until golden on both sides, around 3-4 minutes per side. Repeat with the second batch of tuna patties.
Serve patties hot with your cold sauce from the fridge and enjoy!