Bean and roast vegetable salad

Wait no more! It’s time to stalk beans!   Ingredients (serves 6): 1 medium red bell pepper (capsicum), thickly sliced 1 medium yellow bell pepper (capsicum), thickly sliced 2 medium baby marrow (zucchini), cut diagonally into 1cm-thick slices 100g button mushrooms, halved 1 medium red onion, cut into wedges 1 tablespoon olive oil 2 tablespoons balsamic…