The Origins of the Irish Summer Salad

i guarantee you everyone who's listening to this, you know exactly what i'm talking about. The irish summer salad is the exact same salad up and down ireland. How does every man and da in the country make the same salad on a hot day? What's that about? And i can't find an answer for it. I think our great great grandparents were handed a salad in the kitchen of the landlord's home,. They were just mesmerized at the plate they were holding gone - what tha folk, is this salad?