In a large saucepan, sauté garlic, onion and potato in olive oil over medium-high heat 10 minutes, stirring occasionally. Add water and continue to cook 30 minutes or until potatoes are tender.
Add roasted red peppers and puree soup in a blender or food processor. Simmer over medium heat 5 minutes. Season with salt and pepper.
Stir in lemon juice before serving. Serve hot, garnished with fresh herbs.