Apricots originated from China, and began to spread to Europe in the 16th century. I think the most famous apricot dessert is the French 'tart aux abricots avec crème pâtissière'.
Apricots reached British shores in 1542, and they anglicised the name to apricot tart with pastry cream. It might not be sound quite as poetic, but it is just as delicious. Based on the brands that I used, each slice is about 217 calories.