Gluten-Free Grape Focaccia With Rosemary

Ingredients

• 750 grams of your favorite gluten-free all-purpose flour
• 3 tablespoons psyllium husks (ground chia seeds will work too)
• 2 1/4 teaspoons active dry yeast
• 2 teaspoons kosher salt
• 1/4 cup extra-virgin olive oil
• 2 tablespoons honey
• 1 large egg, at room temperature
• 3-1/2 cups whole milk, warmed to 110°
• 1 egg, beaten
• 8 tablespoons extra-virgin olive oil
• 3 cups halved thom-concord grapes
• 1 tablespoon fresh rosemary needles
• 4 tablespoons raw or another coarse sugar
• 3 teaspoons coarse sea salt