Meat & Potato Flat Bread With Mustard Greens

Ingredients

• 1 3⁄4 t dry active yeast (from one 1/4-ounce envelope)
• 2 c water (110 degrees f)
• 2 t extra-virgin olive oil, plus more for bowl
• 1 t sugar
• 1 t salt
• 4 1⁄2 c bread flour, plus more for surface
• 1 tbsp unsalted butter
• 1 t extra-virgin olive oil, plus more for brushing and drizzling
• 4 scallions, white and pale-green parts only, thinly sliced
• 2 leeks, well cleaned and chopped into 1/4†pieces
• coarse salt and freshly ground pepper, to taste
• 1 lb italian sausage, removed from casings
• 4 c lightly packed mustard greens
• 1 c raw russet potato, peeled and grated
• 1 c parmesan cheese, grated
• italian parsley roughly chopped, as garnish
• very good olive oil for drizzling