If you’re worried about spice, unless you’re using the vein of the jalapeno, the guacamole won’t be spicy – just flavorful. So if you’re looking to keep the spice down, avoid the vein of the jalapeno. If on the other hand, you want some kick, use the vein and feel free to even add a sprinkle of cayenne or throw in a habanero, if you’re really adventurous.