Potato Kasha Knishes

Ingredients

• 1 1/2 cups all-purpose flour, plus more for dusting
• 3 tablespoons extra-virgin olive oil, plus more for brushing
• Kosher salt
• 1/4 cup plus 2 tablespoons cold seltzer
• 2 teaspoons apple cider vinegar
• 1 1/2 pounds russet potatoes, peeled and quartered
• Kosher salt
• 4 tablespoons extra-virgin olive oil
• 1 1/2 pounds Spanish onions, diced
• 1 clove garlic, smashed
• 1 cup whole or coarse kasha (roasted buckwheat groats; available in the bulk aisle or near the dried beans)
• Freshly ground pepper
• Spicy mustard, for serving

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