Spring Sunchoke Fava Bean Salad

Name: Spring Sunchoke Fava Bean Salad
Ingredients: 1/2 small spring onion, thinly sliced; 1/2 teaspoon baking soda; 760 grams whole fresh fava beans; 350 grams sunchoke, peeled and thinly sliced; 1/2 watermelon radish, peeled and thinly sliced; 1/2 lemon zested; 2 tablespoons lemon juice; 1 tablespoon olive oil; 1 teaspoon maple syrup; 1 teaspoon whole grain mustard; 1/2 teaspoon salt; black pepper