What is in the recipe known as Welsh Rarebit?

Well rarebit is a corruption of rabbit , the dish was originally called Welsh Rabbit but Francis Grose mistakenly derived the term in his slang dictionary in 1785. Why it should be called Welsh is a matter of conjecture - some believe it to be because the Welsh were supposed to be fond of Cheese, others that Welsh poor who could not afford meat used Cheese - rabbit was supposed to be the poor Englishman's meat. Other than having a Cheese base there is no agreed recipe for the dish, beer, flour, mustard, bechemel are all used.