With your mixer, use a dough hook to mix yeast, water & 1 tablespoon sugar. Scald milk ,when cool add in shortening, rest of sugar and salt.
Then add beaten eggs, yeast, and flour, 1 cup at a time until the dough starts to pull away from the edge of the mixing bowl. I needed about 5 cups flour but you could need anywhere from 4 and 1/2 cups to 5 and 1/2 cups. The dough will be sticky!
Cover the bowl and let rise until it doubles in size, about one to two hours.
Punch down the dough, knead it well and use a rolling pin to roll it into a 16” x 22” rectangle.
Spread 6- 8 tablespoons of butter on the dough, leaving a 1/2 inch border around the edge.
In a bowl combine 1and 1/2 cups brown sugar with 2 and 1/2 tablespoons ground cinnamon and 2 teaspoons cornstarch. Sprinkle the mixture over the dough and gently press it into the dough. Roll up the dough starting with the long side and cut into 12 rolls about 2 inches thick.
Grease a 9 x 13 inch baking dish and arrange the rolls in the pan. You can also use two pie dishes. Cover with a clean kitchen towel and allow the rolls to rise for another 60 minutes.
Preheat your oven to 350F.
Bake for 21-23 minutes, or until the rolls are a light golden brown.