In a small bowl, melt the butter in the microwave for about 10 seconds.
In a separate small bowl, mix the sugar and cinnamon. Set aside.
Transfer the dough to a lightly floured surface. Use a rolling pin to roll the dough into an approximate 12x22 inch (30x55 cm) rectangle. Use your hands, if needed, to shape the corners into as sharp of corners as you can so the end rolls are uniform with the rest of the rolls.
Use a basting brush or pastry brush to spread the melted butter evenly over the surface of dough.
Sprinkle the cinnamon sugar mixture evenly over the butter.
Use a rubber spatula or spoon to spread the jam evenly over the dough, leaving a 1 inch margin at the edges of the dough.
Sprinkle the strawberries over the jam evenly.
Carefully roll the dough into a long cylinder starting with the long edge. As you roll the dough, gently lift the part that has been rolled and set it down over the next part of the filling, rather than simply rolling it and pulling the dough toward you. The dough needs to be rolled somewhat loosely to prevent the filling from squeezing out as you roll it.
Use unscented dental floss or a sharp kitchen knife to cut the rolls into 12 equal sized rolls. This part will be messy and you may need to use your hand to support the sides with the filling to prevent it from squeezing out while you cut the rolls. The easiest way to do this is to cut the large roll in half, then cut those halves in half again. This allows you to visually cut the four smaller pieces of dough into three equal sized rolls.
Place the rolls in a lightly greased 9x13 inch baking pan. Tip: place the end rolls upside down so the cut edge is facing up. Then, gently flatten the roll to the level of all the other rolls. This will help it appear similar to the other rolls once baked.
Cover the rolls with plastic wrap and allow them to rise until they appear fluffy and are starting to touch each other (about 2 hours).Note: Once the rolls have proofed, you can either bake them or refrigerate overnight to bake the next day.