Since we're specifically talking about brassicas, I will chime in that the biggest "bang" IMO is broccoli. I grow an aspabroc broccolini variety, and it has two big benefits: it's insanely cold hardy (survived temps in the high teens F without cover this year), and it will keep sending up side shoots until it bolts from heat (or I suppose dies of old age, but I haven't had that happen, yet). In the fall, I plant them and keep harvesting off them until late winter/early spring (early March, which is technically meteorological spring in my parts, even though astronomical spring doesn't start until late March), when I replace them with new plants and start the cycle anew from April into May.
That's a beautiful romanesco, ElPollo! I grow them, too, because they are very tasty and very expensive at stores here!
