Beat the egg whites in a clean dry stainless-steel or glass mixer bowl. When peaks begin to form, add the fresh lemon juice and continue to soft peaks. If ready before the syrup, turn the mixer to low or stop briefly.
Combine the raw honey and filtered water in a small stainless-steel saucepan. Bring to a boil and cook until a candy thermometer reads 235 to 240°F; keep the amber syrup fluid and remove it before it darkens.
Turn the mixer to low. Pour the hot syrup into the whites in a slow narrow stream aimed between the whisk and the side of the bowl, not directly onto the moving whisk.
Set the saucepan on a heat-safe trivet. Turn the mixer to medium-high and beat until the meringue becomes glossy and the bowl and mixture cool to room temperature.
Add the homemade vanilla only after the meringue has cooled. Beat just until evenly mixed.
Serve promptly. If the honey meringue separates while waiting, whip it again once and serve immediately.