Toasted baguette slices are topped with a mixture of mild white beans, tangy balsamic vinegar, bitter arugula, sweet tomatoes, red peppers, and rich olive oil.
Cut one tomato into 1/4-inch pieces, and place in a medium bowl. Add the white beans, 2 tablespoons olive oil, the balsamic vinegar, red-pepper flakes, thyme, salt, and pepper, and stir to combine. Set mixture aside.
Heat oven to 350 degrees. Brush bread slices with remaining olive oil. Place on a baking sheet, and bake until golden brown, about 10 to 15 minutes. Just before serving, cut remaining tomato in half, and rub each toasted bread slice with the tomato. Divide bean mixture among toasted bread slices.
The toast and the bean mixture can be made ahead and assembled before serving.