Just rip up a handful of spinach and let simmer in the soup a few minutes before serving. Just don't uncover them too early. Wait until the time you should be planting seeds and uncover your greens gradually. You might have to re-cover your greens on cold spring nights. If you strip off the mulch too quickly, your plants might freeze to death.
Peas are a good fall crop.
You have to plant them 12 weeks before the first frost. So, it's probably a little too late for most of us to plant peas. However, if you feel lucky, you can always plant a quick maturing variety and hope for the best. In the lower latitudes, the cool autumn weather can make it much easier to grow peas now rather than in the spring. Root crops also do well in the fall garden.