"The genius galette, a rustic, freeform tart, is easier to bake than pie. It requires a few simple ingredients, and minimal equipment, meaning that with some pantry basics, a home cook can put one together for no more than the cost of fresh (or frozen!) produce. A galette can be sweet or savory, filled with any imaginable combination of fruits or veggies, meats, cheeses, and spices. They are great for a party--they can be prepared in advance, but...