Try this Raspberry Lemon Cake recipe, or contribute your own.
Why does the crumb turn out gummy when the milk replaces water directly in boxed cake mixes? Substituting dairy liquids for water introduces extra proteins and fats that alter the gluten network and starch gelatinization. Boxed bases rely on exact liquid ratios to achieve a light crumb. When milk and lemon juice replace the water called for on the package, the acid immediately curdles the milk, creating an impromptu buttermilk that softens the structure while adding density.
Heating the raspberry preserves for precisely 15 seconds liquefies the pectin bond just enough to spread it evenly without boiling off moisture. Pouring sweetened condensed milk over holes poked with a fork requires a five-minute cooling period so the crumb absorbs the liquid rather than dissolving into a paste. Whipping the 4 ounces of softened cream cheese before adding lemon curd prevents lumps from forming in the topping.