How to Make It
Preheat the broiler. Bring a medium saucepan of water to a boil. Add the beans and cook until tender, about 5 minutes. Drain the beans and transfer to a bowl of ice water to cool. Drain, then peel and discard the tough outer skins.
In a food processor, puree the beans with the garlic, thyme, lemon juice and lemon zest. With the machine on, add 3/4 cup of the olive oil in a thin stream and process until smooth. Scrape the fava bean puree into a medium bowl and season with salt and pepper.
Brush the bread slices on both sides with the remaining 1/4 cup of olive oil. Arrange the slices on a baking sheet and broil about 4 inches from the heat for 1 minute per side, or until golden and crisp.
Spread the toasts with the fava bean puree and arrange the crostini on a platter. Drizzle with olive oil, sprinkle with salt and serve with lemon wedges.