What can I use instead of double cream for cake?
Heavy Cream (US) at 1:1 is the closest match — The standard swap in each direction. Pouring and cooking uses are identical; whipped heavy cream sets slightly softer, and for very rich ganache the lower fat reads marginally lighter. If that is unavailable, Mascarpone + Milk (3/4 cup mascarpone + 1/4 cup milk, whisked).
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