Corned Beef & Cabbage Tacos

Ingredients

• 1 1/4 cups masa harina flour
• 8 ounces shredded purple potatoes
• 1 tablespoon chopped scallion, plus 2 tablespoons
• 1 teaspoon salt
• 1/2 cup hot water, plus more if needed
• 1 1/2 cups shredded green cabbage
• 1 1/2 cups shredded red cabbage
• 1 cup shredded carrot
• 1/4 cup spicy mustard
• 1/2 cup mayonnaise
• 3 tablespoons prepared horseradish
• 1 lb purple potatoes, peeled, cubed and cooked
• 3 tablespoons olive oil
• 3 cups shredded corned beef
• 1/2 cup cilantro leaf
• 2 fresno chilies, sliced into thin rounds
• 1 lime, cut into wedges
• kosher salt
• ground black pepper