Mini Cornmeal Cakes with Heirloom Tomato Relish

INGREDIENTS

• 2 small heirloom tomatoes, seeded and finely chopped (about 1 pound)
• 1/4 cup chopped fresh basil
• 1 teaspoon extra-virgin olive oil
• 1/2 teaspoon kosher salt
• 1/2 teaspoon freshly ground black pepper
• 3 garlic cloves, minced
• 1.75 ounces all-purpose flour (about 1/3 cup)
• 2 tablespoons yellow cornmeal
• 1/4 teaspoon kosher salt
• 1/4 teaspoon freshly ground black pepper
• 4 1/2 tablespoons whole buttermilk
• 1 large egg, separated
• Cooking spray
• 4 teaspoons crème fraîche or reduced-fat sour cream