Right from go, today it was going to be potato and rosemary pizza for the challenge.
The thought had sprouted and taken root–they were one eyed, focused, and firing to find pizza bases and the right sort of potatoes.
And of course the rosemary was growing at home, the garlic in the garlic basket and the olive oil in the pantry.
The undressed pizza bases were scored at the cost of $2.66 for 4 dinner plate sized. (Boys actually purchased 9 for $6 as part of a deal, so we were flexible with the RLC rules.) The remaining bases have been frozen for future use.

A trip to the friendly market  potato stall man and the ensuing discussion led to the purchase of the recommended Purple Congo potatoes, which were to be sliced thinly and laid on the garlic, chopped rosemary and olive oil doused base.
Another dressing of garlic oil and then 10 mins in a hot oven filled the house with the heady aromas of garlic and rosemary.
The potatoes cost $3 for 8, of which we ended up using half.
So, $2.66 and $1.50 plus free rosemary, about 80c olive oil and 50c garlic, give or take. Total of about $5.50.
Cheaper than chips.
We are and will again be, purple potato pizza eaters.