Re: Fat sources
Fish are my favourite, as they come as practically a complete low carb meal. Excellent protein, fat with plenty of omega 3, lots of variety with variations on pro to fat ratio. Just add salad, and maybe some ham or chicken if the protein level is not quite enough for you (I often do this with mackeral as it's high fat to pro ratio).
Aside from fish;
whole eggs, lamb (pref grass fed), coconut oil, chicken wings, pork scratchings, nut butter, walnut oil (cheap, good omega 3 content and great added to quark), salami.
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