Secret ingredient?
In mushy peas????
It's PEAS!
All mushed up!!
Unless the secret ingredient is the addition of PIE, but then it's not mushy peas - it's Pie & Peas, and any glimmer of secrecy of pie based introduction has failed miserably!
Secret Ingredient, my best hat! Who does Reg think he is? Colonel Sanders with his secret recipe?
For peas...
