In a small bowl, place 3 tablespoons of flour from the measured flour, the yeast and a pinch of sugar. Stir in 2 tablespoons of warm water.
Cover with plastic wrap and allow to double in bulk – about 15 to 20 minutes.
In a food processor fitted with the steel blade, place the remaining flour, salt and sugar.
Process 5 seconds to mix.
Cut the cold butter into small pieces and place in a circle over the dry ingredients.
Process until the butter is indistinguishable in the mixture, about 20 seconds.
Scrape down and process 20 seconds more. Place the eggs in a circle over the dry ingredients, pour the cream over the eggs, and add the sponge, also in a circle.
Process approximately 25 seconds until the ball, which initially forms, breaks down into a creamy, evenly dispersed batter in the processor bowl. Do not stop processing until this batter is formed, as the motor may stall when you try to restart it.
If it doesn't break down after the allowed time, that's fine. Just continue with the instructions.
For an easy way to clean the dough off the blade, pulse the processor several times. The centrifugal force will throw most of the dough off. Remove the blade and scoop the remainder out.
The dough, which is more like a batter, will be very sticky and that is as it should be. Remove it from the processor bowl and place in a bowl sprayed with a non-stick baking release.
Place plastic wrap directly on top of the batter and cover with a towel. Let rise at room temperature 2 ½ to 3 hours, longer if the room is cool until doubled in bulk. Stir down with a spoon, re-cover with plastic wrap and refrigerate overnight. The dough may or may not rise again in the refrigerator. It doesn’t make a difference. Deflate the dough and use as directed.
Note: This dough may be held in the refrigerator up to 3 days before serving.
Yield: About 715 grams or about 25 ounces.