Using a sharp knife, trim the stem out of each collard leaf. Rinse collards with cold running water to remove any dirt. Place collards in large, heat-proof storage container.
Combine 3 quarts water, salt, sugar and lemon juice and bring to a boil. Pour hot brine liquid over cleaned collards. Cool to room temperature and then refrigerate. Let collards soak in brine overnight.
Drain chicken livers. Remove any obvious veins and chop as fine as possible. Season chopped livers liberally with salt and pepper. Heat olive oil until shimmering in a heavy-bottomed pot. Add sausage and cook halfway before adding seasoned livers. Cook through and reserve for later.
Add 2 tablespoons olive oil to the pot. When hot, add onions, celery, garlic, 1 teaspoon salt and 1/8 teaspoon pepper. Sweat, stirring frequently, until onions are translucent. Add spices and sweat a couple of minutes more.
Add tomatoes, chicken stock and bay leaves. Bring to a simmer and adjust seasoning if necessary before adding rice. Cook, covered, for 20 to 30 minutes or until rice is cooked through. Spread cooked rice on sheet pan and cool to room temperature.
Transfer cooled rice to a large bowl. Fold in cooked sausage and liver mixture, pecans, currants and lemon zest.
Drain brined collards. Lay flat on a clean work surface. You may have to shingle a couple of leaves to make a large enough wrapper for the filling. Scoop a scant ¼ cup of dirty rice filling into the middle of the collard wrapper. Use your fingers to shape the filling into an oval about 2 inches long. Fold right and left sides of collard wrapper over onto the filling, then fold bottom up and roll into a cigar shape. Finished dolmades should be rolls with tucked-in sides that fully contain filling.
Heat grill. Rub dolmades with a little olive oil, and grill on medium heat until wrappers are slightly charred. Serve warm with Comeback Sauce on the side for dipping.
Related Recipes: Local Ingredients, Global Roots.