Chocolate Banana Gelato
Ripe fruit reads first and cocoa closes: soft, dark and creamy, with the fruit never cooked, so what you taste stays fresh rather than jammy.
Ripeness is the one specification you cannot correct later. The bananas need to be heavily speckled, because that is when the starch has turned and the fruit carries both its aroma and most of its own sugar. The cocoa powder is the second label to read: look for 22 to 24 percent fat and cocoa alone in the list, since the cheap 10 to 12 percent powders read dusty and thin once frozen, and the bar should say cocoa butter rather than vegetable fat. Those choices pay off at modest doses here, 45 g of powder and 35 g of 70 percent chocolate per kilo, with 200 g of fruit stirred in cold so it never meets heat.
Banana is also an unusual fruit to balance. It carries roughly 24 percent solids and about 16 percent of its own sugar, close to double what a normal fruit brings, so it is a sweetener as much as a flavor. That is why added sucrose stops at 80 g per kilo and why total sugars read 18.39 percent against a floor of 17 and a ceiling of 22.
The cocoa is held back on purpose. Forty-five grams of cocoa powder and 35 g of dark chocolate at 70 percent, with cream limited to 65 g, because the 8.5 percent fat ceiling simply does not allow more and the reading already sits at 6.33 percent. There is also a flavor argument: past a certain point the cocoa eats the banana and you are left with a chocolate gelato that has a strange aftertaste.
Ingredients
Makes 1000 g of finished base.
| Ingredient | Grams | Home measure |
|---|---|---|
| Whole Milk | 476 | 2 cups |
| Banana | 200 | |
| Sugar (Sucrose) | 80 | 1/3 cup plus 1 tablespoon |
| Heavy Cream 35% | 65 | 1/4 cup |
| Cocoa Powder 22-24% | 45 | |
| Dark Chocolate 70% | 35 | |
| Glucose Powder | 35 | 3 tablespoons |
| Dextrose (Glucose) | 30 | 2 1/2 tablespoons |
| Skim Milk Powder | 21 | 3 1/2 tablespoons |
| Lemon Juice | 8 | |
| Carob Seed Flour | 4 | |
| Salt | 1 |
Method
Chilled chocolate base with the banana blended in raw
- 1Whisk every dry ingredient together first: sugars, milk powder, stabiliser and salt. Dry-blending them stops the stabiliser clumping when it meets liquid.
- 2Warm the liquids to 40 C (104 F), then rain the dry mix in while whisking hard.
- 3Heat to 82 C (180 F) and hold for 2 minutes so the stabiliser hydrates.
- 4Melt the chocolate to 45 C (113 F) and stir it into the hot base off the heat, then blend 60 seconds until glossy.
- 5Chill in an ice bath to under 5 C (41 F) within 2 hours. Slow cooling is where bacteria and coarse crystals both start.
- 6Age 6 to 12 hours in the fridge under 5 C (41 F). This is when the stabiliser and the milk protein take up water.
- 7Fold the fruit in cold, after ageing. Heating it costs you the fresh aroma and nothing is gained.
- 8Freeze in a shallow metal pan 2 to 3 cm deep, breaking the crystals with a fork every 30 to 40 minutes, 4 to 6 times.
- 9Freeze firm, then temper 10 to 15 minutes in the fridge before scooping.
The balance
All six against the professional range for Milk Gelato with Fruit.
The two readings under pressure here are both floors, not ceilings. MSNF comes to 6.64 percent against a floor of 6.0, because 200 g of banana is mostly water and dilutes the dairy solids, and the fix had to be 21 g of skim milk powder rather than simply more milk, since water is already at 62.2 percent in a 57 to 67 band. Sugars at 18.39 percent likewise sit just above their 17 floor, and most of that came from the fruit rather than the sugar jar. PAC lands at 256.61 in the lower half of 220 to 300, which is intentional: with a fifth of the mix being fruit, a high PAC would have given you something that never sets at home freezer temperature. The 35 g of glucose powder is the tool that made that possible, adding solids without dragging the freezing point down with them.
Banana browns in minutes. Its polyphenol oxidase goes to work the moment the fruit is cut, and a grey chocolate banana gelato is a defect you cannot argue your way out of. The 8 g of lemon juice exists for exactly this, dropping the pH out of the enzyme's comfort zone and tying up the copper in its active site, so blend the banana together with the lemon at the moment you cut it, not afterward. Second, do not pasteurize the banana. Cooked banana loses its fresh isoamyl acetate note and gains a jammy cooked flavor, which is a different dessert. Pasteurize the dairy and cocoa, cool the base down, then blend the raw banana puree into the cold base. Third, use very ripe fruit with spotted skins, because the starch has already turned to sugar. Green banana leaves starch that gelatinizes and gives a pasty, doughy body. And freeze soon after the fruit goes in, since this mix does not want a long rest once the banana is present.
If it goes wrong
The banana oxidized between cutting and freezing.
Blend the fruit with the 8 g of lemon juice at the same instant you cut it, add it to an already cold base, and get the mix into the freezer without a long wait.
The fruit was heated with the base during pasteurization.
Pasteurize only the milk, cream, powder and cocoa. Chill that base fully, then blend the raw banana in. There is no version of this recipe where the fruit gets cooked.
Underripe bananas, whose starch had not yet converted to sugar.
Use bananas with heavily spotted skins. Beyond texture, they also carry the sugar this balance counts on to reach 18.39 percent total sugars.
Allergens: milk
- https://icecreamcalc.com/knowledge-base/balancing/
- https://www.dairyscience.info/ice-cream/154-ice-cream-mix.html
- https://www.scuolagelato.it/en/gelato-naturale-balancing-software/
- https://icecreamcalc.com/2021/03/12/chocolate-gelato/
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