Cut top 1/3 off of the garlic; place in tin foil on a baking sheet.
Drizzle with 1 tablespoon olive oil.
Bake until garlic is very tender and golden brown, about 1 hour. Cool.
Peel garlic cloves.
Combine beans, roasted garlic, 1 tablespoon oil and lemon juice in processor; process to a smooth paste. Thin, if necessary, with chicken broth to desired consistency.
Season with salt and pepper.
Spread onto lightly toasted crostini and garnish with tomatoes.