Try this Homemade Ice Cream in a Bag recipe, or contribute your own.
- Carbohydrate 5.335825 g
- Cholesterol 44.77 mg
- Fat 13.91563 g
- Fiber 0 g
- Protein 3.58223 g
- Saturated Fat 8.661285 g
- Serving Size 1 1 Serving (245g)
- Sodium 24760.2995161771 mg
- Sugar 5.335825 g
- Trans Fat 0.719117999999998 g
- Calories 160 calories
Step-by-step
- Fill the large plastic food storage bag half full of ice, and add the rock salt. Seal the bag.
- Put milk, vanilla, and sugar into the small bag, and seal it.
- Place the small plastic food storage bag inside the large one, and seal it again.
- Hold both ends of the plastic food storage back and shake it back and forth until the mixture is ice cream, which takes about 5 minutes.
- Take the small bag out of the big one and enjoy the ice cream!
Unlike conventional churn-based freezing methods that rely on mechanized electric compressors to slowly incorporate air into a custard base, this bag-shake technique achieves rapid phase change through the chemical depression of freezing points using rock salt. Standard domestic ice melts around thirty-two degrees Fahrenheit, but introducing sodium chloride forces the melting ice to absorb latent heat from its surroundings, driving the temperature of the slurry down toward negative six degrees. This intense thermal gradient causes the dairy fats and sugars sealed inside the inner quart-size container to crystallize within five minutes of vigorous agitation. The resulting structure features microscopic ice crystals comparable to those produced by standard machine processing, provided the shaking remains continuous and energetic enough to prevent large ice aggregates from forming along the bag walls.
Scaling this preparation beyond a single serving requires careful calculation due to thermal exchange limits. Doubling the dairy volume inside the small bag alters the surface-area-to-volume ratio, significantly increasing the duration required for the core temperature to drop below twenty-eight degrees Fahrenheit. When larger quantities are desired, splitting the dairy mixture across multiple quart-size bags rather than crowding a single pouch maintains the rapid heat transfer necessary for smooth textural development. Each individual bag still demands its own dedicated enclosure filled with fresh ice and a full six tablespoons of rock salt to achieve the required freezing intensity without stalling halfway through the crystallization phase.
Gloves or a thick kitchen towel are mandatory equipment during the agitation phase because the exterior gallon bag reaches temperatures capable of causing mild cold burns on bare skin within seconds. Holding the sealed unit by the top corners prevents accidental pressure leaks while allowing for the rapid back-and-forth motion needed to continuously scrape newly formed crystals off the interior plastic lining. Monitoring the viscosity visually helps determine readiness; once the liquid transforms into a semi-solid emulsion that resists shifting when tilted, the chemical reaction has finished and the container requires immediate removal from the brine.
Freezing this homemade confection for long-term storage is strongly discouraged because the absence of commercial stabilizers and emulsifiers leads to severe recrystallization during standard freezer cycles. Without mechanical churning to break down ice matrices during a secondary hardening process, stored portions transform into a solid block of flavored ice rather than maintaining a scoopable consistency. Consume the mixture immediately upon reaching the desired softness, or discard any leftovers that have begun to separate back into liquid dairy fractions.
