Place corona beans in a large bowl. Cover with a generous amount of water and let soak, 8 hours or overnight.

Drain beans into a pot. Add 3 quarts fresh water and bay leaves. Bring to a boil, stir, and reduce heat to medium. Simmer until just tender but not too soft, 45 to 60 minutes.

Preheat the oven to 350 degrees F (175 degrees C).

Drain beans and spread into a large casserole dish. Add red onion, garlic, tomato sauce, tomato paste, honey, 1/2 cup dill, olive oil, salt, pepper, cayenne, vinegar, and water. Mix until well combined. Place the dish onto a lined baking sheet to catch any spills.

Bake in the preheated oven until top is bubbling and caramelized and beans are soft, about 1 hour. Check periodically and add more water if casserole is too dry.

Stir casserole and smooth the top. Garnish with feta cheese and 1 tablespoon dill.