Clean and remove the roots from the green onions; remove the stem of the jalapeno or pepper of choice, removing the seeds is not necessary. Jalapeños are easily accessible, but if you want a more authentic Caribbean feel, shoot for the scotch bonnet or the habanero. Rough chop the onions and peppers and add to a blender.
Use a mortar and pestle or spice grinder to grind up fresh allspice berries. Using fresh allspice adds a better flavour but isn't necessary. If you have ground allspice laying around use it!
Toss all the remaining ingredients into the concoction and blend them until thoroughly mixed and a fragrant liquid has formed. If you have an immersion blender you can add the ingredients to a deep bowl and use the stick blender if you choose.
Check for seasoning and salt before adding anything to the marinade. It should be sweet and spicy with a kick of heat and salt. A very distinctive “island-y” flavor which is great for wood burning ovens!