Toss cubed potato with a pinch of cumin, salt and olive oil to coat. Roast on cookie sheet in a 400 degree F oven until brown. Let sit to cool.
Put dressing ingredients in a mixing bowl and mix. Add vegetables, toss and add fish last. Toss and adjust seasonings. Let sit and reseason before serving.
Recipe courtesy of Stuart Tarabour, Kitchen Market, New York City, NY