The objective of the current study was to create a frozen dessert with reduced fat and sugar content, using plant-based ingredients and to evaluate its physical, rheological and nutritional properties. The dessert formulations were developed using plant-based ingredients such as sweet potatoes, potatoes, carrots, and beetroot, combined with date sugar, corn starch and skimmed milk powder. Chemical analysis showed that the sweet potato (SP) sample had the highest energy value due to its carbohydrate and fat content, while the carrot (CR) sample had the lowest. Rheology tests revealed that beetroot-based (BR) samples exhibited the highest viscosity, likely due to the high dietary fibre content in beetroots, while the CR sample was the most fluid, attributed to its lower solids content. The study showed that air bubble size influenced texture and melt behaviour. The overrun, a measure of air incorporation, was highest in the BR sample, contributing to a lighter texture. The hardness of the desserts was influenced by solid content and ingredient composition, with the CR sample being the hardest. Melting rate analysis revealed that all samples melted slowly, with the SP, SPP (sweet potato + potato), and BR samples melting uniformly over time. Overall, the study demonstrated that plant-based ingredients could effectively replace traditional high-fat animal-based ingredients, yielding frozen desserts with favourable nutritional profiles, acceptable rheological properties, and desirable physical characteristics.

Pastry cream contains wheat flour, which is not suitable for celiac patients who require a gluten-free diet. Potatoes are known as a good source of starch, minerals and vitamins. They also contain protein, dietary fibre and various phytochemicals. Their addition to pastry cream can both serve as a texturizing agent and enrich the nutritional value of the final product. This study aimed to evaluate the suitability of potatoes as a replacement for wheat flour in pastry cream. For study purposes, the physicochemical attributes of eleven potato varieties were evaluated. Among other varieties, the boiled potato variety Gala exhibited higher fibre, fat, phosphorus and potassium content; however, significantly higher protein (12.48 ± 0.08 g 100 gE−1 DW) and iron (3.12 ± 0.02 g 100 gE−1 DW) content. Higher antiradical activity (18.72 ± 0.74 mM TE 100E−1 g DW) was detected in potatoes of the variety Blue Congo. After preliminary investigation, wheat flour was replaced with mashed potatoes, making up 30% of the cream weight, and its impact on the pastry cream was studied. It was established that potatoes had a significant effect on pastry cream colour and texture. American Rose, Imanta, Rigonda and Viviana were selected as the most suitable from the eleven varieties tested. The addition of potatoes in pastry cream doubled its fibre and potassium content, whereas, other changes in nutritional value of the creams were variety dependent.