Add dried Irish moss to a large bowl and cover with filtered water. Allow to soak for about 15 minutes.
Once soaked, the seaweed will be re-hydrated and expanded. Wash well, and rinse with filtered water.
Place in a small pot, and add milk, vanilla extract, salt and cinnamon sticks.
Place pot on a burner on medium heat and bring to a simmer, then reduce to low heat for about 30 minutes.
After 30 minutes, the seaweed will be mostly dissolved. Filter out seaweed chunks and cinnamon sticks by pouring mixture through a mesh sieve.
Whisk egg yolks in a separate bowl, and slowly add warm seaweed-milk mixture, a small amount at a time so the eggs yolks don't get clumpy. Once you have added half of the mixture, combine all together and whisk.
To enjoy as a warm porridge-like dish, add some maple syrup or honey, some butter, and some milk on top.
To enjoy as a cold panna-cotta like pudding, add maple syrup or honey to taste and place in the refrigerator until solidified. Serve with a berry compote on top.
To use for an Irish moss drink, let the amount needed cool. Store the rest in the refrigerator or freezer until needed.