This recipe has been passed around among friends and from mothers to daughters for almost 50 years – a testament to these wonderful cookies.
In a double boiler, melt chocolate bits over simmering water. Meanwhile, beat egg whites with a dash of salt until foamy. Gradually add sugar, beating well until stiff peaks are formed. Beat in vanilla and vinegar. Fold in melted chocolate and walnuts. Drop onto greased cookie sheets, and bake for 10 minutes at 350 degrees F.