Steep the tea. Bring 3 cups water to a boil. Divide evenly in 2 mugs and add 1 tea bag to each cup. Move the tea bag up and down a few times. Leave the tea bags to steep; you will be serving the tea with tea bags inside.
Infuse the lavender syrup. Bring ½ cup water and granulated sugar to a boil. Add the lavender flowers and stir. Boil and steep until the sugar dissolves and the water is very aromatic, about 4 minutes. Strain the lavender syrup over a sieve over each mug, dividing the infusion evenly.
Froth the half and half. Rinse and return the pot to the burner and set to low heat. Add the half and half and immediately whisk until frothy and just warm. Pour half the foam over each cup and serve immediately.