The research, compiled by Good Housekeeping, tested 10 of the biggest name supermarkets in the UK.
Seven burgers, one veggie burger, eight burger buns, seven sausages, one veggie sausage, eight hot dog rolls, 300g of coleslaw and a 300g potato salad made up the shopping list.
A 2l bottle of lemonade and a 2l bottle of cola, as well as BBQ sauce, mayonnaise and ketchup completed items included.
And Aldi was the cheapest by far, with the total shop coming in at £14.11 – less than half of the top priced supermarket Marks and Spencer, which came in at £26.89.
However, year on year, Aldi’s prices have nudged up and cost 9.1 per cent more than they did in the same test last year.
This trend was seen across the board, as the cheapest complete basket using different products from different stores was £1.37 more expensive than last year.
Not every supermarket has seen prices rise, with Waitrose’s basket costing 10 per cent less than last year, and Co-op costing a whopping 20 per cent less.
Caroline Bloor, Consumer Affairs Director at Good Housekeeping said: “Even with the good vibes that the heatwave brings, it’s disappointing to see a pretty significant rise in prices from the budget supermarkets on already squeezed consumers.
“Nonetheless, if consumers are willing to be a little bit savvy, there are still great BBQ deals to be found, so our advice is shop around for the best value and quality – and to enjoy the food and sunshine, of course!”
Cheapest for a one-stop shop
The cheapest ingredients across all supermarkets
Seven burgers: Lidl, £3.19
One vegetarian burger: Iceland and Tesco, £1
Eight burger buns: ALDI, 85p
Seven sausages: Morrisons, 97p
One vegetarian sausage: Iceland, £1.25
Eight hot dog rolls: ALDI, 90p
300g coleslaw: Asda and Morrisons, 36p
300g Potato salad: ALDI, 59p
2l bottle of lemonade: Asda, ALDI, Morrison’s and Lidl, 17p
2l bottle of cola: Asda, ALDI Morrisons, 17p
Bottle of BBQ sauce: ALDI, Lidl, 79p
Bottle of mayonnaise: Asda, 41p
Bottle of ketchup: Asda, 38p