Preheat oven to 425°F (220°C). Toss halved potatoes with olive oil, salt, and pepper. Roast for 25–30 minutes, flipping halfway, until golden and crispy.
Boil shelled favas for 2–3 minutes, then shock in ice water. Peel the outer skins to reveal bright green beans.
Make the Dill Pesto or use an already prepared one.
In a large bowl, combine the warm roasted potatoes and peeled fava beans. Add a few spoonfuls of dill pesto and toss gently to coat. Fold in most of the feta cheese, saving some for topping.
Transfer to a serving platter. Sprinkle with the remaining feta, plus any optional garnishes like crispy shallots, fresh dill, or lemon zest.
Notes
Peel those fava beans - the skins are tough and bitter. We want is that buttery, bright green center.Use a light hand with the pesto at first - start with a few spoonfuls, toss, then taste. Add the feta at the end - feta adds a creamy, salty pop. Fold most of it in gently, and save a little for the top.