Plum and Rhubarb Crisp

Name: Plum and Rhubarb Crisp
Ingredients: 4 tablespoons (55g) butter (salted or unsalted); 1/4 cup (45g) packed light brown sugar; 14 ounces (400g) rhubarb (washed and sliced into 1/2-inch (2cm) pieces); 8-12 dark red plus (pitted and quartered); 1 tablespoon honey; the seeds from 6-8 cardamom pods (crushed); 1 cinnamon stick (broken in half); 1 half-inch wide strip lemon peel; 2 1/2 cups (350g) flour; 6 tablespoons (70g) light brown sugar; 2 teaspoons ground cinnamon; 14 tablespoons (205g) butter (salted or unsalted, melted); 1 tablespoon granulated sugar (for scattering on top)