Soak the yellow peas in about 3 cups water until soft, this can be done overnight in a slow cooker on low or 3 to 4 hours on high. Drain
Over medium heat place a small saucepan
Add the olive oil, onions, and garlic
Saute until translucent about 5 minutes, turning every once in a while
In a blender (or you can use an emulsifier in the slow cooker) put the roasted carrots, split peas, onions, garlic, and 3 cups broth. Blend until smooth.
Pour back into the slow cooker, add seasonings and herbs, let simmer on low for 4 to 5 hours or until ready to serve
(This can all be done on the stove top in a large saucepan and let simmer until warmed)