I've Been Lying to my Sister for Years

I (26m) have been lying to my sister (38f) for over a decade. To make a long story short, my sister had custody of me since I was 14, and so she filled the mom role in my life. Buying clothes, having a roof over my head, cooking dinners, and all that. It's the last one in particular that I've been lying to her about. Shortly after getting custody of me, she asked if anyone ever made me liver. Nobody ever had, so I said I would try it. She very happily made it for us to try, all the while saying that she loves it but never gets to have it since her boyfriend at the time didn't like it, and she doesn't want to go through the effort of making separate meals. She makes it, we have it, and it's one of the most revolting things I've ever tried. The taste, texture, everything. No sauces or seasons can save me. She's not a bad cook either. Every other meal (stromboli, meatloaf, turkey bbq) she's made has been better than anything from any restaurant. I just despise liver. But before I could spit it out, I looked at my sister and saw how happy she was. She was finally able to enjoy one of her favorite meals. This woman selflessly took over the job of caregiver that was unjustly thrust upon her, went through the court system, housing system, and was able to have this little thing to make her happy. So, I swallowed my pride with the liver, and I told her she could make that for us any time. I choked it down each time she made it for over a decade until last year when my girlfriend (24f) and I moved into our own place. I miss seeing her every day, but I sure as fuck don't miss the occasional liver dinner