1. Prepare Your Ingredients: Start by measuring out your almond milk, lemon juice, sweetener, and protein powder. If using fresh lemons, squeeze them to get the required juice and zest one for extra flavor if desired.

2. Add Liquids to Blender: Pour the unsweetened almond milk and fresh lemon juice into your blender. Ensure your blender is clean and ready for action.

3. Incorporate Dry Ingredients: Add the scoop of vanilla protein powder and the granulated erythritol (or your chosen sweetener) to the blender. If you’re using lemon zest, add it in now as well.

4. Add the Ice: Pile in the cup of ice cubes. The ice is crucial for achieving that wonderfully frosty, thick texture that makes this shake so satisfying.

5. Blend Until Smooth and Frosty: Secure the lid on your blender and blend on high speed for about 30-60 seconds. You’re looking for a completely smooth consistency with no ice chunks remaining. The shake should be thick and frosty, resembling a slushie. If it’s too thick, add a splash more almond milk; if it’s too thin, add a few more ice cubes and blend again.

6. Taste and Adjust: Open the blender and taste a small spoonful. This is your chance to adjust the sweetness or lemon tang. Add more sweetener if you prefer it sweeter, or a tiny splash more lemon juice for extra zest. Blend for another 5-10 seconds to incorporate any additions.

7. Serve Immediately: Pour your frosty lemonade protein shake into a tall glass and enjoy immediately. The frosty texture is best when consumed right after blending.