Roll out the puff pastry on a floured surface and sprinkle with cinnamon sugar. Roll into a log and cut into 12 pieces. Chill in the fridge for 30 minutes.
In a saucepan, heat the coconut milk, sugar, and cinnamon stick until the sugar dissolves. Remove the cinnamon stick and let it simmer for a minute.
In a bowl, mix tapioca starch, corn starch, and unsweetened soy milk. Slowly pour the mixture into the saucepan while whisking constantly. Add nutritional yeast, vanilla extract, and turmeric to the mixture and whisk until it thickens. Add kala namak to taste.
Grease a muffin tin and press the puff pastry pieces into the tin. Fill each pastry with the custard mixture (2-3 tablespoons per tart).
Bake for 15-20 minutes until the tarts are golden brown and the custard is set.
Let the tarts cool in the pan for 10 minutes before transferring to a wire cooling rack to cool completely.
Enjoy your delicious vegan Portuguese tarts!
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