Pear-ginger crisp

Name: Pear-ginger crisp
Prep time: 25 min
Cook time: 50 min
Total time: 1 h 15 min
Ingredients: 4 tbsps unsalted butter; 3 tbsps sugar; 1 1/2 tsps cornstarch; 1.5 tsps fresh lemon juice; 1 tsp grated fresh ginger; 5 lbs ripe but firm Bartlett pears; 3/4 cup slivered almonds; 2.5 ounces all purpose flour; 1/4 cup packed light brown sugar; 2 tbsps chopped crystallized ginger; 2 tbsps sugar; 3/4 teaspoon ground ginger; 1/8 tsp salt; 5 tablespoons unsalted butter, melted and cooled