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Carefully peel your hard-boiled eggs, then slice them in half lengthwise.
Remove the yolks and place them in a medium-size bowl. Mash them with a fork until all that's left is a fine crumble.
Add the crème fraîche, mustard, and salt. Stir together until smooth.
Transfer the mixture to a piping bag fitted with a tip and pipe into the egg whites. Top with caviar and chives, then serve immediately.
Serving: 1g, Calories: 133kcal (7%)