Pasta with Asparagus and Lemon Sauce
Ingredients:
-
2 lemons
-
1 (16 ounce) box penne pasta
-
5 tablespoons butter, divided
-
¾ pound asparagus, trimmed and cut into 1-inch pieces
-
salt and freshly ground black pepper to taste
-
3 tablespoons all-purpose flour
-
¾ cup heavy cream
-
1 ½ cups vegetable broth, or more to taste
-
4 sprigs fresh parsley, chopped
-
1 pinch white sugar, or to taste
-
2 ripe tomatoes, seeded and diced
-
½ cup freshly shaved Parmesan cheese