01 - Preheat oven to 400°F. Slice the top from the garlic head to expose cloves. Drizzle with olive oil, wrap tightly in foil, and roast for 25 minutes until soft and golden.
02 - While garlic roasts, bring vegetable broth or water to a boil in a medium saucepan. Add orzo and cook uncovered for 8-10 minutes, stirring occasionally, until just al dente. Drain orzo, reserving 1/4 cup cooking liquid.
03 - Once garlic is roasted, squeeze softened cloves from skins into a bowl and mash to a smooth paste.
04 - In a large skillet over medium heat, melt butter or warm olive oil. Stir in mashed roasted garlic. Sauté for 1 minute until aromatic.
05 - Add cooked orzo, reserved cooking liquid, chopped herbs, salt, pepper, and lemon zest to the skillet. Toss gently until mixed and heated through, about 2 minutes.
06 - Remove skillet from heat. Fold in grated Parmesan if desired. Season to taste and serve hot, garnished with additional fresh herbs.