Add ice the pineapple juice to a beverage shaker and shake vigorously to cool off the pineapple juice.
Pour into a beverage glass.
Add a splash of grenadine. (you don't need much and it will turn your drink pink).
Pour in Töst.
Garnish with pineapple or cherries.
Notes
Alternativley, you can serve the drink over ice. This is a great option if you need a big batch. You want to add the Tost to individual servings. But you can set out a pitcher of pineapple juice mixed with grenadine and put over ice, adding Töst to the top.Don't have Töst? No problem! There are a bunch of other na sparkling wines available. Substitute with your favorite. Or just add club soda or unflavored seller's. This would also be delicious with a coconut LaCroix for a hint of Pina colada flavoring.I would not add sparkling grape juice or sparkling cider to this becasue it will be really sweet. But that's just me. I don't like things that are too sweet (except cake). If you experiment with other sparkling beverages let me know.