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To prepare Russian dressing: Bound mayonnaise and ketchup in a tiny bowl till relaxed. Lag in capers and jam (or enjoy).
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To prepare sandwiches: Warmth 2 teaspoons oil in a neat nonstick skillet over medium-high heat. Add onion and mushrooms; cook, stirring in general, till the onion is softened, 4 minutes. Add spinach and cook, stirring, till it has wilted, 1 to 2 minutes. Switch the mix to a plate.
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Coat the pan with the the leisure 1 teaspoon oil and return to medium heat. Add the bread; divide cheese equally amongst the slices. Divide sauerkraut between 2 slices and divide the spinach combination between the different 2 slices; cook till the cheese has melted and the bread is golden brown, 4 to 6 minutes. Switch sandwich halves to a slicing board. Divide the dressing between the spinach halves. Fastidiously location the sauerkraut halves on top. Minimize sandwiches in half of and encourage.
To originate ahead
The dressing will withhold, lined, in the refrigerator for up to 2 days.
