Grilled Rhubarb Brown Betty

Name: Grilled Rhubarb Brown Betty
Ingredients: 1 cup panko (Japanese breadcrumbs); 1/4 cup plus 2 tablespoons packed light brown sugar; 2/3 cup plus 1/4 cup granulated sugar; 1 1/2 teaspoons ground cinnamon; 1/2 teaspoon ground allspice; 1/4 teaspoon ground ginger; Pinch of ground cloves; 5 stalks rhubarb, cut into 1-inch pieces (about 4 cups); 1 teaspoon fresh lemon juice; 1/2 cup roughly chopped almonds with skins; 4 tablespoons cold unsalted butter, cut into small pieces, plus more for the skillet; Strawberry ice cream, for serving