Pickled Asparagus

Back on pickling day, we made some pickled asparagus which didn't seal. We knew we'd have to get eatin' and yesterday was our first sampling. They turned out GREAT and I would absolutely do them again, this time in good canning jars and not those stupid swing top jars.
This is the recipe I used, but I totally forgot to add the chili flakes. I will next time, but it was still tasty without.

Pickled Asparagus
30 asparagus spears
1/3 cup coarse salt
2 quarts cold water
1 2/3 cups distilled white vinegar
2/3 cup sugar
1 teaspoon coarse salt
1 teaspoon mustard seed
1 1/2 teaspoons dill seed
1 white onion, sliced into rings
1/2 teaspoon chili pepper flakes
2 sprigs fresh dill

Trim the cut end of the asparagus spears, and cut them into 3 inch lengths. Place them in a large bowl with 1/3 cup salt, and cover with water. Let stand for 2 hours. Drain and rinse under cool water, and pat dry.
Sterilize two pint size wide mouth jars in simmering water for 5 minutes.
In a saucepan over medium heat, combine the vinegar, sugar, 1 teaspoon of salt, mustard seed, dill seed and onion rings. Bring to a boil, and boil for one minute.
Pack the asparagus spears, tips up, in the hot jars leaving 1/2 of space from the rim. Tuck one dill sprig into each jar, and sprinkle in 1/4 teaspoon of red pepper flakes. Pour hot pickling liquid into the jars, filling to within 1/4 inch of the rim. Wipe rims with a clean damp cloth, and seal with lids. Process in a boiling water bath for 10 minutes.
Cool to room temperature. Check seals when cool by pressing the center of the lid. It should not move. Label and date; store in a cool dark place. If any jars have not sealed properly, refrigerate and eat within two weeks.