The flavors on these potato skins was inspired by chaat: a popular Indian street food and snack. The crispy potato skin is loaded with sweet, spicy, sour and crunchy flavors from a trio of sauces and roasted chickpeas. It is worth seeking out chaat masala for these as the umami flavors it brings are irreplaceable. A generous dusting of the spice blend before serving heightens the whole plate.
Preheat the oven to 425˚ F. Bake the potatoes and prepare the skins as directed.
Meanwhile, make the tamarind sauce: Combine the dates, 2/3 cup water, the tamarind paste, cumin and a large pinch of salt in a small saucepan. Cook over medium-low heat, stirring and smashing the dates, until slightly thickened, 15 to 20 minutes. Press through a fine-mesh sieve into a bowl; season with salt.
Make the yogurt sauce: Mix the yogurt and lemon juice in a separate small bowl; season with salt. Refrigerate both sauces until ready to use.
Make the relish: Combine the chile pepper, shallot, garlic and a few pinches of salt in a mini food processor and pulse until finely chopped. Add the cilantro and ginger and pulse, scraping the sides, until finely chopped.
Assemble the potato skins: Brush the skins on both sides with the melted butter and sprinkle with the chaat masala. Arrange skin-side up on the baking sheet. Bake until crisp, about 10 minutes per side. Let cool 5 minutes on the baking sheet. Top with the sauces, relish, crispy chickpeas and more chaat masala.