Blackberries. I grew up on a 80 acre farm and we had two creeks that ran through it. Both creeks had massive walls of blackberry bushes along them. There was more than we could ever eat.
We would go down with massive bowls and pick them for hours. The best is when they are so big you have to be really careful when you pick them or they explode in your hand.
My favorite was putting about about a half inch of milk in a cup and then fill the cup with blackberries and sprinkle some sugar on top and give it a genital stir. A delicious mess.