What ingredients have you used lately that you said you'd NEVER use?
Mine were anchovy paste and capers. I found a link on this site for Grilled Tuna Salad Nicoise:
I've never cared much for anchovies and I hated capers when I first tried them (years ago) so I hesitated to use them. But the rave reviews for this recipe, including one from someone else who's no anchovy advocate, convinced me to follow it to the letter. I still don't know about capers but a teesney dab of anchovy paste made all the difference in the dressing. I'm convinced.