Combine all the dressing ingredients and heat slightly in a small saucepan or in the microwave just to melt the peanut butter. Whisk well to emulsify and set aside to cool.
Remove the loose outer leaves of the cabbage and cut out the cores. Cut each half in 2 quarters, and thinly shred. I do this on my mandoline slicer set at 1/8 inch. You can also do it by hand with a knife. Put in a large bowl.
Add the onion, bell peppers, cucumber, mango, and herbs and give everything a toss to combine. Now toss with enough dressing to evenly moisten the salad. If you have extra dressing you can serve it on the side.
Transfer the salad to a serving bowl and garnish with more fresh herbs and the cashews.
Notes
*I buy raw cashews and toast them in the microwave for a minute on high. It’s the quickest and best method for toasting nuts.