How to Make It
In a medium bowl, cover the fava beans with 2 inches of water and add the baking soda; stir to dissolve. In a small bowl, combine the Aleppo pepper flakes with 2 tablespoons of water. Refrigerate the beans and Aleppo pepper overnight.
Drain and rinse the fava beans and add them to a saucepan. Cover with 2 inches of fresh water and bring to a boil. Simmer over moderately low heat for about 20 minutes, until just tender. Season with a generous pinch of salt and cook for 10 minutes longer, until softened. Drain the beans, reserving 1/4 cup of the cooking liquid.
In a medium bowl, using a pestle or the back of a spoon, crush the garlic to a paste with a pinch of salt. Whisk in the tahini and lemon juice. Whisk in 1/4 cup of water.
Pour the tahini sauce into a wide serving bowl. Mound the warm fava beans in the center and pour the reserved bean cooking liquid on top. Drizzle with the Aleppo pepper paste and the olive oil and serve.