Spinach Yogurt Soup with Caramelized Butter - Kosher.com

Ingredients

• 2 tablespoons Tuscanini Olive Oil
• 1 white onion, finely chopped
• 1 teaspoon ground cumin
• 1/2 teaspoon chilli/hot red pepper flakes
• 800 milliliters/3 and 1/4 cups vegetable stock, such as Manischewitz
• a small bag of fresh spinach, leaves chopped
• 175 grams/scant 1 cup yogurt
• 1 egg
• 2 teaspoons plain/all-purpose flour, such as Glicks
• 40 grams/3 tablespoons butter
• a sprinkling of ground sumac (optional)
• salt, to season
• freshly ground black pepper, to season