Ingredients
- 1 envelope (¼ ounce) active dry yeast
- ½ cup warm water (110 degrees)
- ½ cup buckwheat flour
- ½ cup all-purpose flour
- ½ teaspoon coarse salt
- ¾ cup plain yogurt
- 1 tablespoon unsalted butter, melted
- ½ teaspoon sugar
- 2 large eggs, separated
- 1 to 3 ounces caviar, such as sevruga, for serving
- Creme fraiche, for serving
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