Ingredients:

• 1 medium cabbage, finely shredded
• 1 1/2 teaspoons kosher salt, plus more to taste
• 4 carrots, grated
• 2 red onions, very thinly sliced
• 2 fresh jalapeños, sliced, optional
• 1 teaspoon dried oregano
• 2 cups (480 ml) apple cider vinegar