Preheat the oven to 180°C (350°F). Once the dough has risen, roll it out into a large rectangle. Spread butter on the dough, then layer half with raspberry jam and sprinkle the other half with poppy seeds.
Sprinkle cinnamon and sugar (preferably brown sugar, though regular works too) on top.
Fold the dough over itself from the sides to the center, so that the middle overlaps slightly. Slice the dough into strips (about 5 cm wide).
Take each strip, twist it, and place it on a baking tray lined with parchment paper. Fold the ends of each knot under to secure it. Sprinkle with extra poppy seeds.
Allow the knots to rise for another 30 minutes before baking.