The key ingredient is that brine, which was 3 tablespoons of pickling salt per quart of water. The whole jar used about 2 quarts of water (and I sub'ed out about a half cup of water for cider vinegar). It may be hard to tell from the picture, but there are about 15-20 cucumbers packed in there. It's a large jar.
The rest of the ingredients are purely optional.
Here's what I did:
Wash the cucumbers and then cut off a sliver from the blossom ends of each.
Next figure out how much water you need: Fill up the empty jar with the cucumbers and then fill it with water. Then empty out the water and measure how much there is.
Make the brine: As I said, I used 3 tablespoons of pickling salt per quart of water. That's about a 5 to 5.5% solution (hence '3/4 sour' - more sour than half-sours, but not in the 7% range that some people prefer).
Then add other stuff to the jar. I used stuff I already had on hand:
A torn up dried chili pepper
bay leaves
peeled garlic cloves
A small handful of "wild" dill growing in my garden*
1/4 to 1/2 teaspoon each of cloves, star anise, brown and hot mustard seed (I probably used a full teaspoon of mustard seed), juniper, allspice, dill seed, and mace.
*I planted dill two years ago. It self-seeded and a bunch came back last year. A very small amount of that came back this year.
So I used a fairly standard mix of spices that go into "pickling spice". In the past I used fewer ingredients. This year I just decided to do a big mixture, for no good reason than I had all of this in the house. One nice ingredient that I've used in the past is a smokey tea.
After adding the spices, add the brine to the jar. At this point, the standard thing is to cover it in some way that keeps the cucumbers submerged. As you can probably tell from the picture, I filled the jar just about to the top. So I just put some plastic wrap on top and pressed it down to the top of the brine. It isn't airtight, but cucumbers won't be popping out. I'll let this sit for a couple of weeks in a dark closet. When it's fully fermented, I'll strain the brine, boil it, cool it, and then add it back to the jar. The whole thing gets stored in the fridge.