Place the dried hibiscus flowers and apricots in a medium saucepan and top with 750ml (3 cups) of water.
Bring to a boil, then lower hear and simmer for 10 minutes. After 10 minutes, turn the heat off, cover and leave to soak for 20 minutes.
The Chillies
While the above is simmering, put the kettle on.Heat a small frying pan over medium-low heat and with a pair of scissors, cut the chillies straight into the pan in 2-3 pieces, losing as much of the seeds as you can. Dry toast the chillies for 3 minutes. Don't let them burn.
Tip the chillies out into a bowl and top with the just boiled water. Cover, and leave to soak for 20 minutes, like the hibiscus and apricots.
Blending
Using a slotted spoon, transfer the now soft hibiscus and apricots into a blender. Drain the chillies and add to the blender, followed by 2 Tbsp of the lime juice, tajín and 2 Tbsp of the sugar. Hold on with the salt.
Add 2 cups of the hibiscus-apricot soaking liquid, which should be a deep burgundy colour.
Blend everything until you have a fairly smooth mix.
Taste and add more sugar, lime juice or salt as necessary. You are going for a sweet, sour and salty flavour. You can also add more soaking liquid if you want your chamoy runnier. Blend again to mix.
Transfer to a sterilised jar and keep in the fridge for up to a month.