Crush the saffron threads, soak the raisins in warm water and keep them aside.
Melt the butter in a saucepan over low heat. Once melted, add the milk and heat the mixture until it's lukewarm (around 37°C). This helps the yeast activate without scalding it.
Pour the lukewarm mixture into a large bowl or a stand mixer bowl.
Add the sugar, yeast, egg and crushed saffron.
Let it sit for about 5–10 minutes until the yeast activates and becomes foamy. This step is optional if you are using instant dry yeast.
Mix salt into the 500 grams of flour into the liquid mixture and start kneading. Add 1 tablespoon of more dough at a time and knead until a smooth dough forms. The dough should be soft but not sticky.
Transfer it to an oiled bowl and let it rise for about an hour until doubles in size.
After the dough has risen, punch it down and roll it out into a uniform rectangle, about ¼ inch thick. Aim for even thickness throughout, which helps ensure consistent baking.
Using a pizza cutter, cut the dough into approximately 16 strips that are about 1 inch wide. Try to keep the strips uniform in width to make each bun similar in size and shape.
Take one strip and start rolling it tightly from one end, coiling it toward the centre. When you reach the middle of the strip, stop rolling. Then, turn the strip around and roll from the other end toward the centre, creating an "S" shape with the two spirals facing opposite directions.
Keep the dough covered with a damp cloth or plastic wrap during the resting and shaping stages to prevent a dry outer layer.
Repeat the same for all the strips.
Place the soaked raisin or currant in the centre of each spiral on both ends of the "S."
Arrange the shaped buns on a baking sheet lined with parchment paper, cover them lightly, and let them rise again for about 30 minutes before baking.
This shaping method gives each Lussekatt a beautiful, symmetrical “S” shape and lets the spirals hold their shape well as they bake. Place a raisin in each curl.
Let the buns rise for another 30 minutes until they’re puffy. This final proofing step will make the buns light and fluffy after baking.
Preheat the oven to 220°C. Brush the buns with a beaten egg for shine, then bake for 8–10 minutes or until golden.
For an extra moisture boost, brush the freshly baked buns with a light sugar syrup or melted butter. This adds a touch of sweetness and helps seal in moisture. However, this is optional.