Smoothie Freezer Packs

Before you start

Freezer packs move all the chopping, measuring and washing to one session, so a weekday smoothie is just a bag, a cup of liquid and a blender. Each pack holds frozen fruit, a handful of greens and a spoonful of oats or seeds; yogurt, milk or juice goes in at blending time, because liquid frozen into the pack turns it into a solid brick that strains the blender.

The details that matter are freezing the packs flat so they break apart easily, pre-freezing sticky fruit like banana so it does not clump, and squeezing out air to prevent freezer burn. This recipe makes five packs of a berry-banana-spinach mix; once you know the pattern, change the fruit freely.

Ingredients

• For 5 packs3 medium (about 350 g peeled) ripe bananas — sliced
• 500 g (about 4 cups) mixed berries — fresh or already frozen
• 150 g (5 packed cups) baby spinach
• 100 g (1 cup) rolled oats
• 5 tbsp (about 50 g) chia or ground flaxseed
• To blend each pack240 ml (8 oz) milk, plant milk or juice
• 80 g (⅓ cup) plain yogurt — optional, for creaminess

Method

1. Line a baking sheet with parchment. Spread the banana slices in a single layer and freeze for about 1 hour, until firm. This stops them sticking into one lump inside the bag.
2. Wash and dry the spinach thoroughly; wet leaves freeze into icy clumps. If using fresh berries, rinse and pat them dry too.
3. Label each bag with the contents, the date, and the liquid to add. Into each bag put 100 g berries, 30 g spinach, 20 g oats and 1 tbsp chia or flax.
4. Divide the frozen banana slices among the bags, about 70 g each. Press out as much air as possible, then seal.
5. Lay the bags flat on the baking sheet in a single layer and freeze for at least 3 more hours. Once solid, stand them upright like files to save space.
6. To make a smoothie, pour 240 ml liquid and the yogurt into the blender, then empty one pack on top. Blend on high for 45 to 60 seconds, until smooth, adding a splash more liquid if it stalls.

Tips for success

• Put the liquid in the blender first, then the frozen pack. Frozen contents at the bottom can jam the blade.
• Flat bags are easier to break up by hand; if a pack has fused, knock it against the counter before opening.
• Rolled oats blend smoothly from frozen; steel-cut oats stay gritty and are best avoided here.

Substitutions

Mixed berries

Mango and pineapple make a tropical pack; cherries and cocoa nibs make a dessert-style pack. Keep the fruit around 170 g per bag for a balanced smoothie.

Spinach

Kale freezes well but tastes stronger and needs a powerful blender. Frozen cauliflower rice adds creaminess with almost no flavor.

Banana

For a banana-free pack, use 70 g frozen avocado chunks or frozen cauliflower to keep the texture creamy.

Variations

Tropical green

Use 100 g mango, 70 g pineapple, 30 g spinach and 1 tbsp hemp hearts per pack; blend with coconut water.

Chocolate cherry

Use 150 g frozen cherries, half a banana and 1 tbsp cocoa per pack; blend with milk.

Troubleshooting

The pack is a solid brick

Fruit was wet or the bag was frozen upright. Dry produce well, freeze flat and break the pack up before it goes in the blender.

Ice crystals and freezer burn

Too much air in the bag or packs kept too long. Press out the air and use packs within about 3 months.

The smoothie is too thick

Frozen packs need more liquid than fresh fruit. Add liquid 2 tablespoons at a time while blending.

Storage

Keep packs flat or upright in the freezer at 0°F (-18°C) and use within about 3 months for the best flavor and color. Blended smoothies are best drunk immediately, or refrigerated and finished within 24 hours.