Welcome the arrival of spring by hosting a celebratory brunch. Here we feature recipes that are perfect for the main course, including puffy little pancakes filled with lemon curd and mascarpone, and a frittata laced with tasso and cheddar cheese. You will also find a recipe for strata, a comforting casserole made with bread, eggs and milk; ours includes asparagus, that favorite harbinger of spring. To round out the meal, serve a fresh fruit salad and sparkling mimosas, and raise a toast to the new season.