3 Tbs. olive oil
2 leeks, white and light green portions, halved, rinsed well and thinly sliced
4 garlic cloves, minced
1 tsp. chopped fresh thyme
Kosher salt and freshly ground pepper, to taste
1 1/2 cups Arborio or Carnaroli rice
1/2 cup dry white wine
4 1/4 cups chicken broth, warmed
1 1/2 lb. asparagus, tough ends trimmed
1/2 cup grated Parmigiano-Reggiano cheese
3 Tbs. cold unsalted butter, cut into 6 pieces