John Healey will remove import taxes on marmalade, gherkins and more than 100 products in a bid to give families "breathing space" with the cost of living at the Budget.
The chancellor on Wednesday will promise a fresh series of "everyday fixes" to ease the pressure on households.
The measures will also include an end to the so-called cliff-edge for those receiving carer's allowance payments and higher tax-free mileage rates being made permanent.
But the Conservatives said the offer of "cheaper gherkins" was "an insult to families hammered by Labour's tax rises".
Ahead of the Budget, the government said it is removing tariffs on more than 100 "family favourite" products, while supporting farmers facing higher fertiliser costs and households reliant on heating oil.