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U.S. measurements first, metric equivalents in parentheses. Conversions are approximate; oz means weight ounces, not fluid ounces.
- 4 slices dense rye bread (about 8 oz (225 g) total) - 4 tbsp (57 g) unsalted butter, softened - 4 smoked herring fillets, approx. 3 oz (85 g) each (preferably Bornholm-style smoked herring) - 4 egg yolks, approx. 0.6 oz (18 g) each - 1 small red onion, thinly sliced (about 4 oz (115 g)) - 2 tbsp (8 g) finely chopped chives - Coarse sea salt, to taste - Freshly ground black pepper, to taste
- 4 slices dense rye bread (about 8 oz / 225 g total) - 4 tbsp (57 g) unsalted butter, softened - 4 smoked herring fillets, approx. 3 oz (85 g) each (preferably Bornholm-style smoked herring) - 4 egg yolks, approx. 0.6 oz (18 g) each - 1 small red onion, thinly sliced (about 4 oz / 115 g) - 2 tbsp (8 g) finely chopped chives - Coarse sea salt, to taste - Freshly ground black pepper, to taste
1. Lightly toast the rye bread slices until crisp at the edges, then spread each slice with about 1 tbsp (14 g) softened butter. 2. Arrange one smoked herring fillet on each buttered slice. Top each fillet with a few thin rings of red onion. 3. Carefully place one raw egg yolk in a small cup and gently transfer a yolk onto the center of each sandwich so it sits atop the herring (keep yolks whole). 4. Sprinkle chopped chives over each sandwich, season with a pinch of coarse sea salt and a grind of black pepper, and serve immediately so the yolk remains runny and mixes with the fish when pierced.
Per serving | Servings: 4
Nutrition estimated: November 6, 2026
*Values are estimates based on USDA data and mathematical calculations. Actual values may vary. Where data are unavailable, those contributions are excluded. Calories, Carbohydrates, Protein, Fat, Fiber, Sodium, Potassium, Calcium, Iron and Vitamin C are known subtotals. Missing contributions are unknown, not zero.