National Jam Day in United Kingdom
National Jam Day in United Kingdom is held on March 31. This event in the third decade of the month March is annual. 
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Traditionally celebrated by eating a particularly jammy piece of toast.
The first jam recipe. It's attributed to Marcus Gavius Apicius (believed to be pseudonym) and dates from fourth century AD Rome. The book contains over 500 recipes, many using Indian spices, as well as a recipe for soft fruit heated with honey.
But it's very likely that this jelly-esque “jam” took its name from the crushing or squeezing of fruit to make it, reflecting the original “press or squeeze” sense of the verb “to jam.”
Jam in the UK, is what Americans call jelly. Jelly in the UK, is what Americans call "Jell-O". A jam sandwich is usually composed of two slices of bread with jam (or jelly) in the middle.
Did you know that strawberry is officially the nation's favourite flavour of jam? While home-made can't be beaten, it's one of the trickiest to make at home, as strawberries are low in the pectin which makes a jam gel.
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