How can I fix my homemade baby food peas?

I made frozen organic peas into babyfood for my 7 month old. Should I have thawed the peas first? I steamed them for about 10 minutes and then pureed them in my magic bullet, however it didn't come out very puree like. Not all of the peas got mashed. My son is older now so a different texture is good but I am a bit nervous that the peas aren't mashed well. Any suggestions? Thanks.