Out of all my mom’s greatest breakfast hits, dahi toast is easily the most the beloved in our family. This sandwich—a loose interpretation of a recipe from one of my dad’s friends—is totally unexpected (who would ever think to put yogurt between bread?!) and impossible not to like. Imagine a tangier, spicier grilled cheese sandwich. You get that satisfying oily bread crunch, but with onions, chiles, and (my favorite part) a crispy topping of black mustard seeds and curry leaves added into the mix. The glue that holds this recipe together is the tang of the sourdough bread—it’s the perfect foil to the rich, ricotta-like filling. We are a house divided when it comes to accompaniments for dahi toast—my mom and sister like cilantro chutney, while I prefer ketchup. My dad uses both: He swirls the chutney and ketchup together to create a kinda ugly-colored but admittedly delicious super-sauce.