I tried this recipe out of curiosity, drawn to the simplicity and the promise of a jar of pickled onions ready for any whim. I found the layering process to be quite meditative, like assembling a tiny, edible lasagna. The surprise came when I tasted the first slice after just a week — the onions were already delightfully tangy, with a gentle heat from the cayenne that built slowly, like a good story. I expected a longer wait for that perfect pickle. The weeknight cook will find this recipe a godsend, transforming a humble onion into a condiment that elevates any meal. The best part? The pickled onions are ready to use much sooner than expected. I'm already planning to experiment with different vinegars and spices to see how they change the flavor profile. This is a pickling method I'll return to again and again.