Whisk together the mustard, garlic, coriander, vinegar and oil, then season with salt and pepper. Toss the drained beans with half the dressing.
Step 2
Divide lettuce between 6 tumblers. Combine the beans, onion, tomatoes and capsicum and add to tumblers. Sit a wedge of avocado on top, drizzle with remaining dressing and garnish with coriander leaves.