Prepare tomato topping up to two days ahead; cover and store in the refrigerator. Toast bread slices one day ahead; store at room temperature in an airtight container.
Preheat oven to 350°. Stir together olive oil and garlic; brush on 1 side of each bread slice. Place bread slices, garlic sides up, on a baking sheet. Bake 10 to 12 minutes or until lightly toasted.
Whisk together lemon juice and next 3 ingredients in a large bowl. Add tomato and next 3 ingredients; gently toss to coat.
Top each bread slice with tomato mixture (about 2 rounded teaspoonfuls each). Sprinkle with cheese.
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