If modern humans were to enter Eurasia via the Strait of Gibraltar as opposed to the Levant, which would be blocked by a denser population of neanderthals, and agriculture got started in Western Europe (specifically Spain or Italy) instead of the Fertile Crescent, what kind of crops would we be looking at until wheat/rye/barley/oats are domesticated? The only thing native to Western Europe that I can find that remotely resembles a grain is clovers, which are lower in calories than other cereals but come with a variety of other health benefits.
Thoughts anyone?