How to Make It
Preheat the oven to 400°. In an enameled cast-iron casserole, combine the onion and olive oil, season with salt and cook over moderately high heat until the onion is soft, 8 to 10 minutes. Add the water and peas and bring to a boil. Cover and simmer over moderately low heat for about 15 minutes.
Meanwhile, spread the bread cubes in a single layer on a baking sheet and bake for 6 minutes, until they just begin to brown. Drizzle the toasted cubes with the melted bacon fat or butter and toss to coat. Return the bread to the oven and bake for 6 minutes longer, until golden brown and crunchy. Set aside.
Using an immersion blender, puree the soup until completely smooth. Alternatively, transfer the soup to a blender and puree, then return to the pot; keep warm over very low heat.
In a small bowl, combine the yogurt with 1/4 cup of the pureed soup. Whisk until smooth. Add another 1/4 cup of the soup and whisk again. Whisk the pea soup–yogurt mixture into the rest of the soup and season with salt and pepper. Ladle the soup into bowls, garnish with mint and bacon croutons and serve immediately.
One serving: 224 cal, 8 gm fat, 2.8 gm sat fat, 32 gm carb, 6 gm fiber, 8 gm protein. Tip: Top with a dollop of Greek yogurt and eat chilled for lunch the next day. Tip: Double the crouton recipe and use on salads throughout the week. Tip: Make toasts grilled in a little bacon fat and spread with any leftover cooked peas smashed with herbs and a bit of ricotta or goat cheese.