Bring 3/4 cup water to a full rolling boil in a small saucepan.
Add the lavender and stir well.
Lower the heat so the water is still simmering, and stir for one minute.
Turn off the heat, but leave the saucepan on the burner.
Stir in the sugar until fully dissolved.
Cover the saucepan (still on the turned-off burner) and let the lavender, water, sugar mixture steep for 10 minutes, or until you can clearly see a color change. (Don't steep too long or the syrup will be bitter or too brown.)
Strain through a fine mesh sieve/strainer.
Add 1/2 teaspoon lemon juice to help brighten the syrup's color.
Store in a covered jar in your fridge for around 1 week.