San Jacinto Day was April 21 and than means... (no, we don't get that day off anymore)-- dewberry season is here!
I checked my usual berry-picking spot on Monday April 26 and found plenty of red berries, so in a few more days there should be some ready to pick. As you can see from this picture, they like to hide in the grass, so when you go picking, besides the bug spray, sun screen, long sleeves and pants (to keep from getting scratched by the thorns), and closed-toe shoes (in case of ants or snakes), you need to have a good-sized stick--#1 to help warn any snakes that may be nearby that you're coming (I, btw, have never seen a snake on any of my dewberry picking jaunts), and #2 to hold up prickly branches so you can reach under and around to get to berries, 'cause the fattest ones are always hiding.
Here's a couple of good stories which include some berry picking:
Bring me some apples and I'll make you a pie : a story about Edna Lewis  by Robbin Gourley
"From the whippoorwill's call on the first day of spring through the first snowfall, Edna and members of her family gather fruits, berries, and vegetables from the fields, garden, and orchard on their Virginia farm and turn them into wonderful meals. Includes facts about the life of Edna Lewis, a descendant of slaves who grew up to be a famous chef, and five recipes."
Blueberries for Sal  by Robert McCLoskey
Little Sal and Little Bear both lose their mothers while eating blueberries and almost end up with the other's mother.
and here's a cookbook for foods that are found in the wild (or just your backyard):
Acorn pancakes, dandelion salad & 38 other wild recipes  by Jean Craighead George
But if you'ld just rather cook something with ingredients you got from the grocery store, just browse in the section of books labeled 641, which is where the cookbooks live.