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Peanut Butter Johnny’s deals in sandwiches and nostalgia.

The food truck is banking on diners like me who remember their childhood brown paper bag lunches, where the highlight was really the Little Debbie snack cake but the main course was, without fail, a peanut butter and jelly sandwich. Mine were usually made with chunky Skippy and a whisper-thin layer of strawberry jam.

At PB Johnny’s, things get fancier, with a wide variety of nut butters and more gourmet flavors of jam, though grape is there, too. The menu is best when you stick to those nostalgic basics with an upscale twist. Elsewhere, the menu stumbled.

The truck is most often parked in the Blackstone District in front of Scriptown Brewing Co., 3922 Farnam St., and that’s where I found it both evenings I visited. But it also parks all over the city, and its website has a user-friendly schedule that makes this truck one of the easiest to find.

The Tin Can is my favorite sandwich of the ones I tried. It has creamy almond butter, thick fig jam, a layer of goat cheese, another of honey and a couple of pieces of thinly sliced bacon all on wheat bread. Diners have the choice of a cold sandwich or a grilled one. I went for the latter.