Wash peas and set in a deep pot with about 6 cups of water or enough to cover peas and the garlic. Soak overnight in a covered pot.
Wash off excess salt off pigstail and boil in fresh water for about 15 minutes.
Remove and rinse in cold water and cut up at joints.
** PRESSURE COOKER METHOD :
When ready to cook, Place the peas and beef (if using) along with the garlic, 2 stalks of scallion roughly cut, 2 sprigs of thyme leaves, a small amount of the pimento and enough water to adequately cover in the pressure cooker, cook on high for 20 minutes after pot starts making the pressuring sound. Remove and check if both are almost cooked and tender. Beef may finish before the peas, if so remove beef, cut up and set aside.
To check if peas are cooked, using a couple peas, place on a plate and try to cut through the middle with a spoon or fork, you should be able to cut through easily without feeling resistance if soft enough. Check a couple peas as some may be soft and others still hard. If needed, pressure another 10-15 minutes at a time until soft enough. (add pig tail to peas before pressuring at this point)
Add pigtail to peas and continue pressuring peas another 10 minutes. If using beef, add back beef at this point. Transfer to a regular deep pot to finish cooking.
Add coconut milk, 2 stalks of scallion, 4 sprigs of thyme leaves, the rest of pimento and 1 whole scotch bonnet pepper (poke a small hole in it with a sharp knife) right after dumplings. Cook on medium heat for about 15 minutes. Add enough water so not thick but semi-liquidy. Or to thickness of your preference.** (optional) Remove pepper from pot if you don't want it to become too spicy.
** If using a regular pot), Place peas and beef (if using) in a large pot to boil. In a sperate pot, still boil pigstail by itself about 20 minutes, cut in pieces, add to peas and continue boiling on high heat. In a regular pot it may take at least 1-1/2 hour or more for peas and beef to cook. Cook until when cut with any utensil, it is mostly soft, and beef mostly soft as well.
When everything is mostly soft, continue adding the other ingredients and cooking according to above directions.