Place farro in a large saucepan and cover with about 2 inches of water. Add sage and rosemary. Bring to a boil; reduce the heat and simmer, uncovered, until the farro is tender but still firm to the bite, 20 to 30 minutes. Remove the herbs and drain.

Heat oil in a large saucepan over medium heat. Add onion and cook, stirring, until soft and beginning to brown, 3 to 5 minutes. Add garlic and cook, stirring, for 1 minute. Stir in the farro, tomatoes, artichokes, basil, salt, pepper and crushed red pepper.

Add 1/2 cup broth (or water), bring a boil over medium heat and cook, stirring, until most of the broth is absorbed. Repeat with the remaining broth (or water), adding it in 1/2-cup increments and stirring until it's absorbed, until the farro is creamy but still has a bit of bite, about 10 minutes total. Stir in 1/4 cup cheese and lemon zest. Serve sprinkled with the remaining 1/4 cup cheese.

Tip: Farro is a high-fiber whole grain that is an ancestor of modern wheat. It is commonly used in Italian cooking and is becoming more popular in the U.S. Find it in natural-foods stores and amazon.com.