Which, if you break it down further:

1. Everyone's "algorithm" is different. Even if you could bake every possible filter into your eGrocery product, can you imagine the UX nightmare?

2. The "that I like the most" is a tough thing to quantify. Who is "I"? Me? My wife? My kids? My mom who's coming to visit this weekend? What do I like? Specific brands? Things I've bought before? From that store, or a different one? Things I might like because they share characteristics?