Churrasco a la Cubana with Bamboo Fungus Escabeche

Churrasco a la Cubana with Bamboo Fungus Escabeche
Yield: 24 servings
Ingredients
For the Parsley Lemon Onion Sauce:
Makes 24 two-ounce portions
1 quart lemon demi Sauce (recipe follows)
1 ½ pounds of onion sofrito (recipe follows)
6 ounces unsalted butter
¾ cup chopped Italian parsley
Salt and pepper
For the Lemon Demi Sauce:
Makes 1 quart
3 cups veal demi glace
8 ounces fresh lemon juice, strained through chinois
2 tablespoons cornstarch
¼ cup water
2 tablespoon salt
For the Onion Sofrito:
Makes 1 ½ pounds
1 ½ pounds white onions, small dice
1 cup olive oil
4 teaspoons minced garlic
4 tsp teaspoons salt