“The trigonometric function of Pork Kimchi Stew and the lake"

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What is "The trigonometric function of Pork Kimchi Stew and the lake"?
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“ Pork Kimchi Stew “
"I put all my heart and soul into making 'Pork Kimchi Stew,' my specialty dish, for David, our second son who has been serving diligently as a missionary at COSTA for 3 nights and 4 days, and is coming back home tomorrow, Thursday. First, I sliced the delicious pork shoulder capicol thickly - capicol is a chewy, juicy part filled with flavor - and sautéed it lightly with some butter and white wine in a pot. Then, I added fresh kimchi, stirred in two spoonfuls of fermented soybean paste, tossed in some onions, poured in the kimchi juice, and let it simmer. After that, I added thickly sliced tofu and instead of mirin, I thinly sliced one apple peel and added it along with two tablespoons of soy sauce. Once it boiled, if it tastes bland, I added two tablespoons of beef dashi and let it boil vigorously until 'Pork Kimchi Stew' is ready."