Windmill
Windmill can produce food.
To be able to do that, they need wheat tiles in their vicinity.
It can also be a good idea to place forest tiles near wheat tiles.
Additionally, too many windmills close to each other reduce their efficiency,
maybe try spacing them further apart.
Nerdy Details
$$f\_reg = \min\{1,\frac2m\}$$$$x = w * (1 - (f * 0.1))$$f: Number of forest tiles adjacent to this onem: Number of windmills in radius 3 for every wheat tilef_reg: Quotient of the number of windmills in the neighborhood for every wheat tilew: Sum of allf_regvalues in radius 3, of the wheat tilesx: Production rate