Lucky that we get to eat fish during Lent. In the old, old, old days you couldn't have fish or any dairy products at all. Bread and vegetables, that's it. Giving up sweets wasn't mandatory, but strongly encouraged. Alcohol was supposed to be out, too.
That's when pretzels came to be popular. They were a Lenten treat, salty and satisfying.
Later on, fish and dairy products were allowed during Lent. Now I think it's Lenten Fridays only when you're supposed to abstain from meat, right?
I remember in elementary school, we always had salmon patties and cream corn every freakin' Friday. And they were awful salmon patties, too. To this day, I can't choke down a salmon patty, but I do like salmon filets.