Makes 2 large flat breads
For the bread dough
3 cups (375 grams) all-purpose flour, plus more as needed
2 cups (280 grams) bread flour or fine semolina
2 1/2 cups (300 grams) whole-wheat flour
1 envelope (2 1/4 teaspoons/7 grams) instant active-dry yeast
2 teaspoons coarse sea salt or kosher salt
2 teaspoons ground coriander seeds
1/4 teaspoon ground mastic
1/2 teaspoon ground black pepper
For the topping
About 1/2 cup (120 milliliter) milk
About 30 dried figs, sliced
2 cups (270 grams) crumbled Roquefort, gorgonzola, or any spicy blue cheese
1/4 cup (15 grams) chopped fresh rosemary leaves
Make the bread dough: In the bowl of a stand mixer fitted with the dough hook or in a food processor, mix the flours, yeast, salt, and spices.
With the motor running, add 3 cups (720 milliliters) water or more to make a soft dough. Work the dough for about 6 minutes, until it is soft and slightly sticky, adding more water if needed.
Oil a large bowl and a piece of plastic wrap. With floured hands, shape the dough into a ball and transfer to the oiled bowl. Cover with the oiled plastic wrap, place in the refrigerator, and let rise overnight. Let the dough come to room temperature (about 2 hours) before proceeding further.
Preheat the over to 375°F. Line 2 large baking sheets with parchment paper.
Shape the laganes: Lightly flour your work surface. Turn the dough out and knead briefly. Divide in two, cover one piece, and flatten the other to fill the first baking sheet. Stretch and dimple with wet fingers to expand the dough to cover the whole pan. Cover with oiled plastic while you shape and place the next lagana on the second baking sheet. Cover and let the dough rise for about 40 minutes.
To top the breads: Brush the breads with milk and divide the fig slices between them, pressing the figs to stick onto the surface of the breads. Sprinkle generously with the cheese and rosemary.
Bake for about 30 minutes, or until the breads are golden at teh bottom. If they brown on top but still look uncooked at the bottom, cover loosely with aluminum foil and bake a bit longer.
Let cool on a rack, slice, and serve warm or at room temperature. Leftover bread can be frozen. Reheat directly from the freezer, loosely wrapped in aluminum foil, in a 375°F oven for about 20 minutes. Open the foil and heat for 8 to 10 minutes more to caramelize the top.