Cut the avocado all the way around, going as deep as the pit. Twist until you can pull the 2 halves apart. Remove the pit with a spoon. Peel the avocado or scoop out the flesh.
Mash the avocados and season with salt and pepper.
Divide the mashed avocado between the 4 slices of toast and crumble the feta over it.
Sprinkle the slices of toast with pomegranate seeds and alfalfa.