A variation on the usual thumbprint cookies, and made with Jamnation jams.

As a Stanford University economics major, Gillian Reynolds was only too familiar with the law of supply and demand.

Now, she’s living it — supplying delicious jams that aficionados are demanding more and more of with gusto.

Reynolds is the founder of San Francisco’s Jamnation. With her brother Christopher, a trained chef, they make jam with local organic fruit, surprising flavorings and a big dose of wittiness.

Just get a load of some of the jam names: “Plum and Get It” (pluot with honeysuckle essence), “Midnight in Pearis,” (Bosc pear butter with vanilla and nutmeg), and “Cardamom Knows Zest” (Seville orange marmalade with cardamom).

Gotta love the cute names — as well as the deliciousness inside.

I had a chance to try a couple samples recently: “Rose to the Grindstone” (Arctic Star nectarines with rose essence), and “Sublemonal Message” (Meyer lemon marmalade with ginger).

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