How to Make Fizzy Lemonade
To make fizzy lemonade, start by stirring together 1 cup of sugar and 1 cup of water in a medium saucepan and bringing the mixture to a boil. Once it's boiling, reduce the heat to low and let it cook for 10 minutes. Next, turn off the heat and give the sugar water 30 to 60 minutes to cool. When it's cool, pour it into a large pitcher with 1 cup lemon juice. Now just add 3 cups of sparkling water to finish your fizzy lemonade!
Combine the sugar and water in a medium sized saucepan. Pour 1 cup (250 milliliters) of water into the saucepan. Add 1 cup (220 grams) of sugar and stir with a spoon or whisk to mix. This will make the simple syrup for your lemonade. Bring the mixture to a boil over medium heat, then simmer it for 10 minutes. Once the sugar water starts to boil, reduce the heat to low, and cook for 10 minutes. For extra flavor, add ½ to 1 cup (15 to 25 grams) of fresh mint or basil leaves. Remove the saucepan from heat and set it aside to cool, at least 30 to 60 minutes. If you added any mint or basil leaves, pour the sugar water through a strainer into another pot. Discard the leaves. Your simple syrup is now complete. Transfer the cooled sugar water to a large pitcher and stir in the lemon juice. Make sure that the pitcher is large enough to hold the sparkling water as well. Don't add any ice yet. Add the sparkling water and make any adjustments. You will need at least 3 cups (750 milliliters) of sparkling water. If you like your lemonade less sweet, use up to 8 cups (2 liters) of sparkling water. If the lemonade is too sweet, add more lemon juice. If it is not sweet enough, add more sugar. If the lemonade is too strong, add more sparkling water. If it is too bland, add more lemon juice and sugar. Serve the lemonade. Add the ice to the glasses you will be serving the lemonade in, not the pitcher. This way, the ice won't water down the lemonade as it melts. You can serve the lemonade as is, or garnish it with mint leaves, basil leaves, or lemon slices. Combine the sugar, lemon juice, soda, and water in a large pitcher and give it a quick stir. You aren't quite ready to make your blended lemonade yet, but the pitcher will make it easier transfer everything later on. This recipe makes an icy, frozen lemonade, similar to a slushy. It won't be smooth like a milkshake or smoothie. Let the mixture sit for 5 minutes. Stir it occasionally. This will help the sugar melt, and the flavors to infuse into one another. Pour the lemon mixture into a blender and add the ice. You will need 2 to 3 cups (475 to 700 grams) grams of ice. The more ice you add, the thicker your lemonade will be. Blend on high speed, pausing every so often, until everything is combined. Now and then, pause the blender, and use a rubber spatula to scrape the mixture down the sides. This will help everything mix in more evenly. The ice should be all broken up by the time you are done. Pour the lemonade into 4 glasses, and serve. You can serve it as is, or you can garnish it with some mint leaves or lemon zest. Squeeze out the juice of 1 lemon into a glass. Cut a lemon in half, and use a lemon juicer to squeeze the juice. Use a strainer placed over your glass to catch any pulp and seeds. Discard the pulp and seeds when you are done. This method makes a great science experiment because the acid in the lemon juice reacts with the baking soda and makes it fizz. Add in an equal amount of water, about 2 to 3 tablespoons. You should now have 1 part water and 1 part lemon juice in your glass. Stir in some sugar. Start with 1 teaspoon of sugar. Stir it to help it dissolve and give your drink a taste. If it is not sweet enough, add another teaspoon of sugar. Now, all you've got to do is add the fizz! If you have simple syrup, you can use that instead. It will mix in a lot easier! Avoid adding too much sugar, or it won't dissolve. If you start to see little grains at the bottom of your glass, you are using too much! Add in 1 teaspoon of baking soda and give it a stir. If this is for a science experiment, consider adding it in ½ teaspoon at a time so that you can see the reaction. Serve the lemonade. You can drink it as is or add some ice to it. As an optional step, you can add a few mint leaves to the beverage. Enjoy! 
Combine the sugar and water in a medium sized saucepan. Bring the mixture to a boil over medium heat, then simmer it for 10 minutes. Remove the saucepan from heat and set it aside to cool, at least 30 to 60 minutes. Transfer the cooled sugar water to a large pitcher and stir in the lemon juice. Add the sparkling water and make any adjustments. Serve the lemonade. Combine the sugar, lemon juice, soda, and water in a large pitcher and give it a quick stir. Let the mixture sit for 5 minutes. Pour the lemon mixture into a blender and add the ice. Blend on high speed, pausing every so often, until everything is combined. Pour the lemonade into 4 glasses, and serve. Squeeze out the juice of 1 lemon into a glass. Add in an equal amount of water, about 2 to 3 tablespoons. Stir in some sugar. Add in 1 teaspoon of baking soda and give it a stir. Serve the lemonade. 