Indian-Style Spinach with Fresh Cheese (Saag Paneer)

Ingredients

• 3 quarts whole milk
• 3 cups buttermilk
• 1 tablespoon salt
• 1 (10-ounce) bag curly-leaf spinach, rinsed
• 3/4 pound mustard greens, stemmed and rinsed
• 3 tablespoons unsalted butter
• 1 teaspoon cumin seeds
• 1 teaspoon ground coriander
• 1 teaspoon paprika
• 1/2 teaspoon ground cardamom
• 1/4 teaspoon ground cinnamon
• 1 onion, chopped fine
• Salt
• pepper
• 3 garlic cloves, minced
• 1 tablespoon grated fresh ginger
• 1 jalapeño chile, stemmed, seeded, and minced
• 1 (14.5-ounce) can diced tomatoes, drained and chopped coarse
• 1/2 cup roasted cashews, chopped coarse
• 1 cup water
• 1 cup buttermilk
• 3 tablespoons chopped fresh cilantro