Put 1 3/4 cups lukewarm water (105 degrees F to 110 degrees F), the yeast, 1/2 cup olive oil and 1 tablespoon each turbinado sugar and salt in the bowl of a stand mixer fitted with the dough hook attachment. Mix on medium speed until the yeast and sugar dissolve, then let stand until foamy, about 10 minutes. Add both flours and mix on medium speed to make a smooth but sticky dough, about 4 minutes.
Poke the butter pieces into the dough, spacing them evenly apart. (Do not mix.) Cover the dough with plastic wrap and set aside in a warm place until doubled in size, 45 minutes to 1 hour.
Mix the dough with the dough hook on low speed just until there are streaks of butter throughout, about 1 minute. Put the grapes and raisins in a microwave-safe bowl, cover loosely and microwave until juicy, about 10 minutes. Let cool, then strain through a sieve, discarding the liquid.
Brush a rimmed baking sheet with 2 tablespoons olive oil. Divide the dough in half and transfer one piece to the baking sheet, leaving the other in the bowl. Cover both pieces of dough loosely with parchment paper; set aside until plump and airy, about 30 minutes. Meanwhile, put a pizza stone or inverted rimmed baking sheet on the lowest oven rack and preheat the oven to 450 degrees F.
Spread the dough on the baking sheet so it fills the pan, dimpling it with your fingertips. Scatter half of the grape-raisin mixture evenly on top. Put the remaining piece of dough on top and stretch and pat it to cover the bottom piece of dough. (Don't worry if the dough tears.) Scatter the walnuts and the remaining grape-raisin mixture on top; dimple the dough all over with your fingertips, poking the topping into the dough. Cover loosely with parchment and set aside until the dough rises above the sides of the baking sheet by about 1/2 inch, 35 to 40 minutes.
Mix the remaining 1/4 cup sugar, the coriander, rosemary, the remaining 3/4 teaspoon salt and the pepper; sprinkle over the dough. Place the baking sheet on the hot stone and bake 10 minutes. Reduce the oven temperature to 400 degrees F and bake until the focaccia is golden and springs back when pressed, 20 to 30 more minutes. Brush with the remaining 2 tablespoons olive oil; let cool in the pan 15 minutes, then transfer to a rack to cool slightly or let cool completely and freeze.
MAKE IT AHEAD Let the focaccia cool completely, then wrap in foil and freeze for up to 1 week. Reheat, wrapped, at 450 degrees F until warmed through, about 25 minutes.
Photograph by Con Poulos

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	542.51 Kcal (2271 kJ)
Calories from fat	265.99 Kcal
		% Daily Value*
Total Fat	29.55g	45%
Cholesterol	20.25mg	7%
Sodium	140.09mg	6%
Potassium	347.13mg	7%
Total Carbs	63.38g	21%
Sugars	15.61g	62%
Dietary Fiber	3.85g	15%
Protein	9.68g	19%
Vitamin C	3mg	5%
Vitamin A	0.1mg	3%
Iron	1.9mg	11%
Calcium	28.7mg	3%

Amount Per 100 g
Calories	310.25 Kcal (1299 kJ)
Calories from fat	152.11 Kcal
		% Daily Value*
Total Fat	16.9g	45%
Cholesterol	11.58mg	7%
Sodium	80.12mg	6%
Potassium	198.52mg	7%
Total Carbs	36.24g	21%
Sugars	8.93g	62%
Dietary Fiber	2.2g	15%
Protein	5.54g	19%
Vitamin C	1.7mg	5%
Vitamin A	0.1mg	3%
Iron	1.1mg	11%
Calcium	16.4mg	3%

* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.

Tastes

salty
savory
bitter
sweet

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