4 Tbsp of sweet butter + 1 tsp to coat the mold
1/4 cup grated parmesan cheese
3 scallions, sliced thin
1 head of escarole trimmed of some green leafy part (about 5 cups)
1 tsp salt
1/3 cup of water
4 Tbsp of flour
1 cup of milk
Pepper
1/2 tsp Worcestershire sauce
1 cup of grated Cheddar cheese (strips optional)
3 egg yolks
7 egg whites

• Butter 1 1/2 quart soufflé mold and add the parmesan cheese. 
• Coat the mold and refrigerate. 
• Reserve the parmesan not needed in the coating.
• Slice the trimmed escarole coarsely.
• Melt 1 Tbsp of butter in a saucepan and sauté the sliced scallions until just tender.
• Add the escarole, salt and water.
• Cook on high for 5 minutes.
• Uncover and continue cooking for a few minutes until all liquid has evaporated.
• Make a béchamel sauce with the remaining butter, flour and milk.
• Add the yolks, mix well.
• Add salad mixture, Worcestershire sauce and the grated cheddar cheese.
• Whip the whites until they form a peak.
• Fold in the escarole mixture gently.
• Fill the mold to the edges. 
• At this point the soufflé can be refrigerated for a couple of hours.
• At baking time sprinkle the reserved parmesan cheese and place the soufflé on a cookie sheet in a 375°F preheated oven.
• Reduce heat to 350°F and bake for 30 to 40 minutes.
• 5 minutes before the soufflé is done you can arrange the strips in a decorative pattern on top.