Cooking dried beans:
Soak the beans overnight. Drain and place in a pan with 4 cups fresh water and the khombu. Bring to the boil before turning down the heat to simmer for 25 minutes or until tender (this can vary significantly depending on the age of the dried bean). Remove the kombu and discard.
Once the beans are cool, remove the skin by making a small slit in its side with a small knife and squeezing the bean out with your thumb and index finger.
Brush the zucchini lightly with olive oil and place on a grill lined with baking paper under a medium flame until cooked and slightly browned at the edges. (approx 4 -5 minutes)
Mix the olive oil, lemon, sumac pepper and 2 tsp chopped mint in a small jar.
Arrange the zucchini on plates with beans, avocado and fresh mint leaves. Drizzle with the lemon and sumac dressing.
Tip Broad beans are in season between June to October but availability is often much narrower. Frozen broad beans are available all year round. They're still extremely nutritious and take a fraction of the time that dried beans take to prepare.