SOFTEN THE STRAWBERRIES (OPTIONAL): If using a standard blender or if the berries taste underwhelming, place the 16 ounces frozen strawberries in a microwave-safe bowl, sprinkle with the 2 tablespoons granulated sugar, and toss to coat. Microwave in 30-second bursts, stirring between each burst, until the berries soften and the sugar dissolves into a glossy syrup, about 1 to 2 minutes total. Skip this step if your high-powered blender handles fully frozen fruit.
LOAD THE BLENDER: Add the 4 large bananas, sliced and frozen, and the strawberry mixture (with all the syrup) to the blender pitcher. Cover with the lid.
BLEND TO SOFT-SERVE: Blend on high for about 30 seconds. The fruit will stop spinning, which is your cue to stop, scrape down the sides of the pitcher with a rubber spatula, and stir the bottom to redistribute the fruit. Repeat the blend-and-scrape pattern 3 to 4 more times for about 2 to 3 minutes total, until the mixture turns smooth, creamy, and pale pink with a soft-serve consistency.
SERVE OR FIRM UP: Spoon the ice cream into bowls and serve right away for the softest, creamiest texture. For a firmer, scoopable consistency, transfer to a freezer-safe container, smooth the top, press a piece of plastic wrap directly against the surface, and freeze for 2 to 3 hours.
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Notes
Soften Before Scooping: This ice cream has no preservatives or stabilizers, so it freezes solid in the freezer. Pull it out 10 to 15 minutes before serving and let it sit on the counter until it's scoopable. That is all it needs.Storage: Once frozen solid in an airtight container, this ice cream keeps in the freezer for up to a year.Equipment Tip: A high-powered blender (think Vitamix or Blendtec) handles fully frozen fruit in one shot. A standard blender works too. Just slice the bananas before freezing and pre-soften the strawberries per Step 1 to give the motor a fighting chance.Variations: Swap strawberries for mango, pineapple, or peaches (same 16-ounce weight). The frozen banana is the magic. It gives the ice cream its creamy, soft-serve structure no matter which fruit you pair with it.