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1
Preheat oven to 350-degrees F.
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2
Use the 1 tsp. butter to grease the sides and bottom of an oven-proof baking dish.*
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3
In a large, deep bowl, combine the apples, sugar, lemon juice, cinnamon, nutmeg and walnuts.
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4
Toss to insure all apples are well coated with the mixture.
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5
Pour into the prepared baking dish.
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6
In another deep bowl, mix the other sugars, flour, oatmeal, salt and cinnamon until it is well blended.
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7
Add the 1/2 lb. of cold butter, a little at a time, and use a pastry cutter or large fork to mash into a rough topping.
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8
The butter should be very cold so it does not melt during this mashing process; it should remain in small beads or chunks, about the size of peas.
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9
When all this butter has been incorporated, add the water and mix again, to further create a crumb-like topping (much like that found on a crumb-topped pie or coffee cake).
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10
Layer this crumbly mixture on top of the apple-walnut filling. Make sure the entire dish is covered in an even layer of sugary goodness.
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11
Use the remaining 3 tbsp. of cold, cubed butter to dot the top of the dish. This will melt and add moisture to the very top during baking.
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12
Bake for 45 minute to 1 hour, until the filling is hot and bubbly and the topping is mostly golden brown.
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13
Allow to cool for at least 30 minutes before serving.
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14
Serve warm or at room temperature, topped with ice cream or fresh whipped cream.
