How to Take Seeds from Vegetable

I can send you drawings of the contraption to take seed from a ram (sheep).

With broccoli I would not know where to start!

Actually rhkramer is right.

http://jn.nutrition.org/content/134/12/3499S.long

Maybe this?

Maybe!

Why overkill?

K.I.S.S

mm

The first step is choosing the seed you will use to grow your broccoli for seed. Some open pollinated cultivars are available, these heirloom varieties are genetically stable and the seed you save will likely be true to type without special effort (or much effort, anyway). Most commercial broccoli seeds are F1 hybrids, and they will not breed true. You will get a very mixed bag of seed from the F1 parent, and you will certainly need more than one type of F1 growing together to get good broccoli seed.

Also take a look at the breeding program working to develop new open pollinated broccoli cultivars. One of the issues they have found in this multi-year program is that the broccoli gets cross-pollinated with other cole crops - anything in the brassica family that is flowering at the same time, including wild mustards, can cross with broccoli. Those seed will be worthless, and you will waste space and effort next year only to produce a handful of weeds. So to make it worthwhile, some isolation of your broccoli from other kin is a good idea.

The real professional advice for broccoli seed saving is found at the International Seed Saving Institute. Not only advice for plant breeding and how to avoid inbreeding depression (which will produce seeds for very weak nonproductive plants), but also how to harvest and process your seed. Green pods are no good, wait for them to turn brown. The pods are like other mustards, hard and not so easy to open - these guys recommend a mallet!

GA

And I can't stand the stuff

There must be something in that family that you like, all the same... what a variety. Seemingly endless array of kissin cousins, and the asian varieties are especially wow. Yu choy sum is way better than broccoli.

Just a note, not all wild mustards will cross with broccoli, it would have to be B. oleracea, and many of the oriental brassicas are B. rapa, so cross with turnip but not broccoli. So the potential for weed crosses may be less than I thought.

Here's a very nice page about seed saving, including some detail about broccoli.