Pour 200 ml neutral oil into a glass.

Chill the glass of oil in the refrigerator for at least 60 minutes.

Pour 150 ml grapefruit juice into a small saucepan.

Heat the grapefruit juice over low heat until it reaches a slow boil.

Add 1 teaspoon agar agar powder to the hot grapefruit juice.

Whisk the mixture until the agar agar is fully dissolved.

Remove the saucepan from the heat and let the citrus mixture cool for 2 minutes.

Fill a syringe with the warm grapefruit mixture.

Drip the grapefruit mixture into the chilled oil to form small pearls.

Strain the pearls from the oil using a fine mesh strainer.

Rinse the citrus pearls briefly with water before serving.