1. Preheat oven to 350°.
2. Remove papery skin from garlic head. Cut garlic head in half crosswise, breaking apart to separate whole cloves. Wrap half of head in foil; reserve remaining garlic for another use. Bake at 350° for 1 hour; cool 10 minutes. Separate cloves; squeeze to extract garlic pulp. Discard skins.
3. Heat oil in a saucepan over medium heat. Add shallots and red pepper to pan; cook 1 minute. Add quinoa to pan; cook 2 minutes, stirring constantly. Add wine; cook until liquid is absorbed, stirring constantly. Add broth; bring to a boil. Cover, reduce heat, and simmer 15 minutes or until liquid is absorbed. Remove from heat; stir in garlic pulp, spinach, tomato, cheese, and salt. Serve immediately.