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This undated photo provided by America's Test Kitchen in May 2018 shows pesto flatbread with artichokes, olives and arugula in Brookline, Mass. This recipe appears in the cookbook “Dinner Illustrated.” (Daniel J. van Ackere/America's Test Kitchen via AP)

This undated photo provided by America's Test Kitchen in May 2018 shows pesto flatbread with artichokes, olives and arugula in Brookline, Mass. This recipe appears in the cookbook “Dinner Illustrated.” (Daniel J. van Ackere/America's Test Kitchen via AP)