Originally eaten only on Shrove - Fat - Tuesday, Semla buns are a rare treat of pastry, almond paste and fluffy cream. The Protestant Reformation meant that Swedes stopped observing a strict fast during Lent and thus semla are usually available in Sweden from shortly after Christmas right up until Easter - although Shrove Tuesday is still the most popular day of the year to indulge in these delicious buns. King Adolf Frederick died of digestion problems as the result of ending a rather rich and hearty meal with the consumption of 14 semlor. Swedes today show slightly more restraint, eating an average of five bakery-produced semla each year - and countless more that have been made at home. This recipe makes roughly 20 of the buns, which we recommend either sharing with friends and family, or else parceling out to yourself carefully; we don't want any King Fred repeats.…