Spanish Coca with Wilted Greens, Walnuts and Raisins

Ingredients

• 1 tablespoon dry yeast
• 2 tablespoons warm water
• 3 cups unbleached bread white flour
• 1 teaspoon salt
• 1 cup warm water
• 4 tablespoons olive oil
• ½ cup golden raisins
• ½ cup walnut halves
• 1 small bunch Swiss chard
• 4 tablespoons extra virgin olive oil
• 2 cloves garlic, minced
• Kosher salt and freshly ground black pepper