Sevruga caviar by John Spottiswood.

In recent years, over-fishing in the Caspian Sea has greatly depleted sturgeon populations. Please consider using caviar and roe from more abundant species until the Caspian Sea sturgeon populations can recover. Greenish-gray sevruga has the smallest eggs and strongest flavor of all the caviars. Because of this, it's cheaper than beluga or ossetra, but still quite good. If substituting an inferior caviar, consider perking it up with a splash of fresh lemon juice.