Combine sugar, chopped strawberries, water, lemon juice, pectin, and Grand Marnier in a large, heavy-bottomed saucepan.

Place the saucepan on low heat.

Bring the mixture to a boil, stirring continuously until the sugar dissolves completely.

Once boiling, reduce heat to a simmer.

Simmer without stirring for 25-30 minutes, or until the jam reaches its setting point.

Skim off any scum that forms on the surface during simmering.

Stir in the quartered strawberries and vanilla bean paste.

Pour the hot jam into sterilized jars.

Seal the jars immediately.

Store the sealed jars in a cool, dry place.

Once opened, store the jam in the refrigerator.