Grilled Pound Cake Sundae With Raspberries

Name: Grilled Pound Cake Sundae With Raspberries
Ingredients: ½ cup (1 stick) unsalted butter, room temperature, plus more for pan; 1½ cups (188 g) all-purpose flour, plus more for pan; 4 oz. cream cheese, room temperature; 1½ cups plus 1 Tbsp. (313 g) sugar; ½ tsp. Diamond Crystal or ¼ tsp. Morton kosher salt, plus more; 3 large eggs; 2 tsp. vanilla extract; 12 oz. fresh raspberries (about 2 cups); 3 Tbsp. Cointreau or other orange liqueur or fresh orange juice; 3 Tbsp. fresh lemon juice; Extra-virgin olive oil (for grill and brushing); Vanilla ice cream and chopped unsalted roasted pistachios (for serving); Flaky sea salt