Can I turn a shrub into a gastrique?

Really enjoying tomato shrub gastique. Busting out last years cherry shrub, reduced and gastriqued. Hope that’s a word.


Working on plum, nectarine, and maybe pluot gastrique.

Nectar Z nectarine is still my favorite for eating out of hand, like a mad woman in the garden, taking on every scrub jay who tries me, so nectarine shrub might not happen.