There is a Steak and Shake a block away from their Round Rock location. Much better. And In-And-Out here uses some kind of strange sauce that just doesn’t sit right with my gut, let alone taste buds.
I have the same problem with Chick-Fil-A, and as much as I would like to patronize CFA, I literally can't. I've tried several times.
An alternative sauce might be called for, or the seasoning or herb that causes the awful taste for me.
I have eaten In n Out burgers for over 60 years. I don’t rememeber any ‘special sauce’.
I always get the Double Double meal.