Cauliflower Fritters

Name: Cauliflower Fritters
Ingredients: 3 large egg whites; 1/4 teaspoon freshly ground pepper; Salt; 6 tablespoons whole-milk yogurt; 1/2 teaspoon baking powder; Salmon caviar, for garnish; 1/4 teaspoon ground cumin; 1/4 teaspoon ground coriander; 1/8 teaspoon ground allspice; 1/2 large head of cauliflower, florets finely chopped (2 cups); 1 1/2 teaspoons extra-virgin olive oil, plus more for frying