MELT 2 tablespoons butter in 13 x 9-inch baking pan in preheated 375° F. oven. Unroll dinner rolls; separate into 16 triangles. Sprinkle triangles with 1 1/3 cups morsels. Starting at shortest side, roll up each triangle; arrange in prepared baking pan. Bake for 15 to 20 minutes or until lightly browned.
MICROWAVE remaining morsels with remaining butter in medium, uncovered, microwave-safe bowl on MEDIUM-HIGH (70%) power for 1 minute; STIR. The morsels may retain some of their original shape. If necessary, microwave at additional 10 to 15-second intervals, stirring just until morsels are melted. Stir in nuts, sugar, lemon juice, water and cinnamon. Pour over hot rolls; return to oven.
BAKE for 5 minutes or until bubbly. To prevent sticking, immediately loosen buns from pan. Cool in pan on wire rack for 10 minutes; serve warm.