Red herring salad--polish sushi in nordic style

Ingredients

• 4-6 herring fillets in oil, neutral, no spices, Matjes are the best,
• 1 cup cornichons (dill pickles),
• 1 medium sweet onion,
• 1 cup mushrooms in vinegar,
• 1 can (15 oz) green peas,
• 1 can (6 oz) of tomato paste,
• 1/2 cup grape seeds oil or any other neutral vegetable oil,
• freshly ground pepper.

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Preparation

• Cut herrings, cucumbers, onion, and mushrooms into very small cubes and put them together in a bowl.
• Rinse the peas in water and add them to the mix.
• In a separate bowl, mix gently the tomato paste, oil, and pepper until you obtain a smooth dressing.
• Pour it over the herring/vegetable mix and combine gently not to destroy the texture of the salad (the ingredients should not get mashed).
  
• Let it marinate for about 2 hours in a refrigerator and serve.