Spinach Potatoes

Ingredients

• 1 ½ pounds Yukon gold potatoes
• 3 ½ to 4 tablespoons neutral-flavored oil
• Kosher salt and freshly cracked black pepper
• 2 teaspoons cumin seeds
• 1 ½ teaspoons black or brown mustard seeds
• ¼ teaspoon asafetida (optional)
• 1 medium-large yellow onion, finely diced
• 5 garlic cloves, grated or minced
• 1 inch piece ginger, grated or minced
• ½ of a serrano pepper, finely chopped
• 1 tablespoon tomato paste
• ½ teaspoon ground turmeric
• 2 teaspoons ground coriander
• 1 teaspoon amchur (optional)
• ½ to 1 teaspoon kashmiri chili powder
• ½ pound Roma or plum tomatoes, finely chopped
• 1 ½ teaspoons kosher salt, plus more to season
• 1 tablespoon fenugreek leaves (optional)
• 10 ounces baby spinach
• 1 teaspoon garam masala
• ½ to 1 tablespoon freshly squeezed lemon juice
• 1 big handful of cilantro, chopped