Add the gelatin in one Tbsp at a time, making sure it's dissolved before adding more.
4 tbsp unflavored gelatin
Keep the heat on low the whole time. You don't want the wine to boil. The heat is solely to dissolve and properly mix all the ingredients.
Pour mixture into a shallow pan and chill in the refrigerator. It doesn't take long to set into a gummy-like texture. You can then cut into squares, or use a cookie cutter to create shapes.