First, make the dressing: In a large bowl, whisk together the mustard, mayonnaise, lemon juice, and curry powder until well combined.
Add the cubed tofu and toss in dressing to coat.
Fold diced celery, red onion, and kale into the curry tofu mixture. Add in the dried cranberries, walnuts, and sea salt (if using). Top with the reserved celery leaves and serve.
CLEAN GREEN TIP: Celery greens are packed with flavor and nutrients. They can take the place of parsley in any dish. Toss them into salads, as well as smoothies!