Lower Intermediate - The best cook
When it comes to food most of us will probably agree that mum's food is the best. However, there will be times when you'll need to explain why you think 'So and So' is the best cook. Sierra & Elias teach you some very useful vocabulary around this subject.
Also, as a request for more lower intermediate lessons -- you could use the already published many intermediate and upper intermediate lessons as a natural springboard for lower intermediate. Say, take a few key phrases from Joha Goes To War or "Palm Trees," and provide more detailed analysis and vocabulary meaning. You could characterize them as supplementary or independent, whatever fits.