2 cups all-purpose flour
1/2 cup white sugar
1 tablespoon baking powder
1/2 teaspoon salt
1 cup crushed pineapple
1 egg, beaten
3/4 cup milk
1/4 cup butter, melted
1/2 teaspoon vanilla essence
juice and zest of 1/2 lemon
1/4 cup butter, melted
1/4 teaspoon ground cinnamon
1/3 cup packed brown sugar
1/2 cup all-purpose flour
Preheat the oven to 375 degrees F (190 degrees C). Grease and flour muffin pans, or line with paper liners.
In a large bowl, stir together 2 cups flour, white sugar, baking powder and salt. Drain pineapple, reserving 1/4 cup juice. Make a well in the center of the dry ingredients, and pour in the reserved juice, egg, milk, vanilla, 3/4 cup pineapple and 1/4 cup melted butter. Mix just until blended.
In a separate bowl, stir together the cinnamon, brown sugar, 1/2 cup flour, and 1/4 cup melted butter to make the topping.
Spoon batter into muffin cups to 3/4 full, then spoon the rest of the crushed pineapple over the batter and sprinkle generously with the cinnamon topping.
Bake for 30 minutes in the preheated oven, until a toothpick inserted in the crown of the muffin comes out clean.