Sourdough Focaccia with Crispy Garlic & Rosemary

Name: Sourdough Focaccia with Crispy Garlic & Rosemary
Prep time: 1 h
Cook time: 20 min
Total time: 1 h 20 min
Cuisine: European, Italian, Mediterranean
Ingredients: 1 cup (8 oz, 224g) active sourdough starter (100% hydration); 1 1/4 cups (10 oz, 300 ml) warm water; 1/2 cup (2.5 oz, 70g) whole wheat flour; 3 1/4 cups (16.25 oz,455g) unbleached all-purpose flour; 1 1/2 teaspoons table salt; 1/4 cup (1.8 oz, 50g) olive oil; 1 head of garlic, peel & mince the cloves (I used a garlic press); 1 scant tablespoon roughly chopped fresh rosemary (from about 1 large or 2 small sprigs); 1.5 teaspoons flaky sea salt