DO-AHEAD TIP: Prepare brown rice according to package directions.
Heat oil in a large saucepan over medium heat. Add garlic and onion, and sauté until onion begins to soften, about 5-7 minutes.
Add tomato sauce, broth, lemon juice and spices (paprika through pepper). Fold in red bell pepper, okra, and mixed vegetables.
Bring to a boil and simmer until frozen vegetables are thawed and starting to soften. Meanwhile, prepare brown rice*.
Stir shrimp into gumbo and cook for 10 to 25 minutes or just until shrimp turn pink and opaque.
Serve immediately over rice and enjoy!