Make the dough: Place butter, yeast, egg, sugar and milk in bowl of a stand mixer fitted with a dough hook, or a large bowl if working by hand. Mixing on low speed or stirring with a wooden spoon, add flour and salt. If mixture looks dry, drizzle in another tablespoon or so of milk. Beat for 2 to 3 minutes in mixer, or 5 to 6 minutes by hand, until you get a soft but not sticky dough. Cover bowl and chill for AT LEAST 2 hours

Make the pistachio cream: Put pistachios in a food processor and blitz until they resemble bread crumbs, then add butter, sugar, egg and flour and pulse until they are well combined to form a paste. Set aside. Cream can be made up to 2 days ahead and stored in refrigerator.

Lightly butter 8 cups of a muffin tin. Remove dough from refrigerator. On a lightly floured surface, roll dough into a 16- by 8-inch rectangle. Work with as little flour as possible so as not to dry out dough. Use a sharp knife or pizza slicer to cut eight 4- by 4-inch squares. Lift each square into a cup in the muffin tin and push all the way down.  Allow excess dough to hang over sides

Divide pistachio cream among cups, then top each with a teaspoon of strawberry jam. Fold corners over lightly to cover filling, but don’t push them down. Set aside in a warm place and let them rise for 40 minutes to 1 hour; the buns' folds should rise considerably.

Place a clean, empty baking sheet in the center of the oven, and heat it to 400 degrees. When buns are done rising, place muffin tin on baking sheet and bake for 10 minutes. Turn sheet front to back, reduce oven temperature to 350 degrees and bake for another 10 minutes.

While the buns bake, make the syrup: In a small pot, bring 85ml water, the sugar and the honey to a boil. Remove from heat and stir in rose water.

Remove buns from oven and brush generously with syrup