It's hard to say for certain. 'The Mulligan' could be inspired by true events but might have been fictionalized for entertainment purposes. You'd need to look into the background and author's intentions to know for sure.
Nancy Mulligan has elements inspired by real life, but it's not a completely factual account. Songwriters often blend reality with imagination to create a compelling narrative.
You can find 'One Punch Man' fanfictions on websites like FanFiction.net. It has a large collection of fan - created stories related to 'One Punch Man'. There are different categories and ratings, so you can easily filter and find the ones that suit your taste.
One Punch isn't a short story. It has multiple characters, plotlines, and arcs that extend over a considerable period, making it a full-fledged fictional work.
The'mulligan stew' in the novel might be a symbol of the characters' shared experiences or the simplicity and resourcefulness within the story's setting. It could represent a communal aspect, like how the characters come together around this simple yet nourishing dish.