boil down

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In fact, all wealth building strategies boil down to the first principle of DOFE: to save 10% to 15% of your after-tax income.
For strawberries (you should have 2-1/2 to 2-3/4 cup puree), use 6 cups sugar, 4 cups water, and 1-1/2 cups lemon juice; boil down to 7 cups.