1. Preheat oven to 350° F. Place baguette slices on a baking sheet and toast for 5 to 7 minutes or until golden brown. Rub the toasted side of the bread with the cut side of the garlic cloves; reserve.
2. In medium bowl, combine tomatoes, grapefruit, avocado, red onion, cilantro, olive oil, salt and pepper; toss gently to combine. Spoon grapefruit mixture over prepared bruschetta. Garnish with fresh grapefruit segments and cilantro, if desired.