Step 1: Prepare the Dough

1. In a mixing bowl, pour warm milk and mash in fresh yeast.
2. Add butter, eggs, cardamom, sugar, and salt, and mix well.
3. Gradually mix in 3 ½ cups flour, stirring with a wooden spoon.
4. If the dough is too sticky, add the remaining ½ cup flour.
5. Cover the bowl and let the dough rise for 30 minutes.

Step 2: Make the Filling

6. In a medium bowl, beat together butter and sugar until creamy.
7. Stir in cinnamon and set aside.

Step 3: Roll and Shape the Dough

8. Transfer dough to a floured surface and knead until firm (about 3 minutes).
9. Divide the dough in half and roll each into a rectangle (½-inch thick).
10. Spread each rectangle with ½ of the cinnamon filling.
11. Stack one rectangle over the other (filling-side up) and roll tightly into a log.
12. Cut the log into 1-inch-thick slices.

Step 4: Let Rolls Rest

13. Place rolls 3 inches apart on a parchment-lined baking sheet (or arrange in a cake pan for pull-apart rolls).
14. Let them rest for 20 minutes at room temperature.

Step 5: Bake

15. Preheat oven to 425°F (220°C).
16. Bake for 10 minutes until golden brown.
17. For pull-apart rolls: Reduce heat to 350°F (175°C) after 10 minutes and continue baking for 10 more minutes, covering with foil if needed.