Out of all my mom¡¯s greatest breakfast hits, dahi toast is easily the most the beloved in our family. This sandwich¡ªa loose interpretation of a recipe from one of my dad¡¯s friends¡ªis 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¡ªit¡¯s the perfect foil to the rich, ricotta-like filling. We are a house divided when it comes to accompaniments for dahi toast¡ªmy 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.