Swedish Pickled Herring

Ingredients

• 1/4 cup kosher salt
• 5 cups water divided
• 1 pound herring fillets
• 2 cups white wine vinegar or distilled
• 1/4 cup sugar
• 1 teaspoon mustard seed
• 2 teaspoons whole allspice
• 2 teaspoons black peppercorns
• 3 bay leaves
• 3 cloves
• 1 lemon thinly sliced
• 1 red onion medium, thinly sliced