This earthy winter pasta isn’t complicated, and that’s exactly what makes it perfect. The ingredient list is short — just five if you don’t count salt and pepper — and it has a delicious combination of flavors to brag about. The caramelized fennel lends a not-too-sweet complexity that balances the richness of sausage. These flavors pool in the wells of the orecchiette, so you get a tangle of all these in every bite.