One time I made a list of foods with high fat/protein ratio. Here are the ones which came to the top of the list:

Heavy milk cream >100
Macademia nuts 11
Pecan nuts 7.3
Cream cheese,whipped 6
Other nuts 2:5
Atkins Ice cream 3.6
Blue cheese 1.6
Boiled eggs 1
Corned beef (canned) 0.5

I hope this can help you.