Separately, whisk the eggs, sugar, oil, and zest. Then add vanilla paste, kefir, lemon juice, and lemon extract, whisking until combined.
1 cup Granulated Sugar, 2 Eggs, ⅓ cup Neutral Oil, 2 Lemons, 1 teaspoon Vanilla Paste, 2 teaspoon Lemon Extract, ⅔ cup Kefir, 1 Tablespoon Lemon Juice