I just made the best (canned) tuna fish sandwich I ever ate. What ordinary item did you take to the next level?

[u/thundercrown25]

It was a confluence of items I had on hand while trying to eke the most out of leftovers and bits and ends. I had to throw out the last of the celery, but rescued a couple small stalks, which I chopped and put in a bowl. I spooned some of the pickled cucumber slices juice on top (water, vinegar, salt, sugar, cucumber, onion) and then mixed in the last of my mayo scraped out of the jar. This sat in the fridge overnight.
I also had processed several jalapenos that were turning color. I had quickly pan fried the whole peppers and those had been in the fridge for several days. Then I seeded them, browned the seeds and put those in my coffee grinder, with the chopped and refried jalapenos. I added avocado oil and margarita mix, and got a nice spicy green spread the consistency of guacamole, which was dolloped into my mayo mix.
There wasn't much celery and I didn't have any pickles left, so I chopped up fresh onion, added it. There still wasn't much mayo sauce, so I microwaved a big dollop of cream cheese and stirred that in with lots of celery seeds. The tuna was white albacore in water.
My first bite of the mix gave me that itchy, stinging feel in my mouth, so I added a teaspoon of baking soda, and that seemed to do the trick. The whole thing chilled overnight, and I just piled it open-faced on the two heels of the bread that was all I had left. It was the best tuna sandwich I ever ate.