Mango muffins

Bahan-bahan (12 porsi)

• 2 1/4 cups plain flour ((all-purpose flour))
• 1 1/4 tsp baking soda ((bi-carbonate soda), sifted if lumpy (Note 1))
• Pinch of salt
• 1/3 cup unrefined coconut oil ((or unsalted butter), melted and slightly cooled (Note 2))
• 1 large egg ((55 - 60g/2 oz each in shell))
• 1 tsp white vinegar ((Note 1))
• 3/4 cup white sugar ((can reduce to 1/2 cup but no less))
• 1 tsp vanilla extract
• 1 cup (260g) mango puréed mango ((1 1/3 cups small chopped mango reduces to 1 cup once pureed, Note 3), room temp)
• 2 cups (370g) chopped mango (, small, 8mm to 1 cm max, room temp (Note 3))
• 1/2 cup desiccated coconut (, unsweetened (finely shredded coconut))
• 2 tbsp demerara sugar ((Note 4))