Place the pan over medium heat and continue whisking until it thickens.
Remove from heat. Cover and cool slightly for about 5 minutes.
Quickly whisk in the butter until it’s smooth and creamy. Use as needed or store for later.
2 tbsp vegan butter or margarine (not unsalted)
Notes
This recipe makes enough to fill an 8 or 9-inch tart (about 1 1/2 cups)
To store, pour into a bowl and cover tightly with plastic wrap to keep in the moisture and to stop it developing a skin. Place in the refrigerator for 3-4 days.