How to Make It
Melt butter in a medium saucepan over medium-high. Add onion; sauté 3 minutes. Add orzo; cook 2 minutes, stirring frequently. Stir in stock, salt, and pepper; bring to a boil. Cover, reduce heat, and simmer 10 to 12 minutes or until liquid is almost absorbed.
Remove pan from heat; let stand, covered, 5 minutes. Fluff with a fork. Stir in tomatoes, parsley, and dill.