In a small skilet over medium high heat, heat the oil. Add the onion and garlic and saute for 5 minutes. Do not let garlic turn brown. Remove from heat.
In a blender or food processor, place the garlic onion mixture and the roasted red peppers. Puree until smooth.
In a stockpot over high heat, bring the broth to a boil. Lower the heat to medium and add the roasted pepper puree. Stir until smooth. Add the tomato juice and simmer for 10 minutes. Add the pepper.
To serve, pour soup into soup bowls. Place 2 slices of lemon per bowl in the center of the bowl. Top with a parsley sprig. Grind more black pepper on top. Serve immediately.