The best Chemex recipe for decaf speciality coffee can vary depending on personal taste preferences and the specific characteristics of the coffee beans being used. This recipe is a great starting point:

Ingredients:
- 30 grams of medium-coarse ground decaf coffee
- 450 grams of filtered water

Equipment:
- Chemex brewer
- Chemex paper filter
- Burr grinder
- Timer
- Scale
- Gooseneck kettle

Instructions:

1. Heat the water to around 200°F (93°C). This is just below boiling.

2. Fold the Chemex filter and place it in the brewer, ensuring that the thicker side of the filter is placed over the spout.

3. Rinse the filter with hot water to preheat the brewer and remove any paper flavor. Pour out the rinse water.

4. Weigh out 30 grams of medium-coarse ground decaf coffee and add it to the rinsed Chemex filter.

5. Start the timer and pour just enough water (about 60 grams) over the coffee grounds to saturate them evenly. Allow the coffee to bloom for 30-45 seconds.

6. After the bloom, slowly pour the remaining water in a circular motion over the coffee grounds, ensuring that all the grounds are evenly saturated.

7. Continue pouring water until you reach a total weight of 450 grams.

8. Once all the water has been poured, give the Chemex a gentle swirl to ensure even extraction.

9. Allow the coffee to drip through the filter completely, which should take around 3-4 minutes.

10. Once the dripping has stopped, carefully remove the filter and discard it.

11. Serve the freshly brewed decaf coffee and enjoy!

Feel free to adjust the grind size, coffee-to-water ratio (we used 15:1), and brewing time to suit your taste preferences and the specific characteristics of your decaf coffee beans. Experimentation is key to finding the perfect Chemex recipe for your decaf coffee. 

What other types of brew methods are you interested in?