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Different proportions of orange-fleshed sweet potatoes (OFSP) were used to substitute cassava mash and fermented spontaneously to produce composite gari-a grittycrispy ready-to-eat food product. Both the amount of OFSP and the fermentation duration (FD) caused significant increases in the β-carotene content of the composite gari. OFSP addition reduced the luminance while roasting made the composite gari yellower when compared with the cake used. Addition of OFSP negatively affected the swelling capacity of the gari although not significant. The taste, texture, flavor, and the overall preferences for the composite gari decreased due to the addition of the OFSP but FD improved them. The sample with 10% OFSP and FD of 1.81 days was found to produce the optimal gari. One portion of the optimal gari would contribute to 34.75, 23.2, 23.2, 27, 17, and 16% of vitamin A requirements among children, adolescent, adult males, adult females, pregnant women, and lactating mothers, respectively. The study demonstrated that partial substitution of cassava with OFSP for gari production would have the potential to fight the high prevalence rate of vitamin A deficiency among less developed regions of Africa.

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