The context in which you wrote indicates that "Jerky" would be a proper noun.
An elementary school student would be taught the following:
A proper noun has two distinctive features: 1) it will name a specific (usually a one-of-a-kind) item, and 2) it will begin with a capital letter no matter where it occurs in a sentence.
Read the following sentences. Notice the difference between the common and proper nouns.
Tina offered Antonio one of her mother's homemade oatmeal cookies but only an Oreo would satisfy his sweet tooth.
cookies = common noun; Oreo = proper noun.
Charlie had wanted an easy teacher for his composition class, but he got Mrs. Hacket, whose short temper and unreasonable demands made the semester a torture.
teacher = common noun; Mrs. Hacket = proper noun.
Gloria wanted to try a new restaurant, so Richard took her to Paco's Mexican Cafe, where no one dips into the hot sauce until the drinks have arrived at the table.
restaurant = common noun; Paco's Mexican Cafe = proper noun.