Pour some raspberry vodka into a small, shallow plate. You need just enough to cover the bottom. Pour some cane sugar into a small, shallow bowl.

Place a martini glass upside down into the vodka, until it just coats the rim. Then, place the rim of the martini glass into the sugar, gently turning until coated. Shake off any excess and repeat with the remaining glass. Set aside.

Place the diced peaches into a martini shaker and muddle until very broken down and juicy.

Add the raspberry vodka and peach schnapps. Place the lid on and shake hard.

Strain the mixture between the martini glasses, until each is about 1/2 full. You may need to shake the martini shaker around every so often to move the peaches around, and get more juice out.

Pour 2 oz of the lemon-lime flavored seltzer water into each glass and gently stir.

Garnish with frozen raspberries, if desired, and sip away!