Honest-to-goodness

Is the clam chowder made with honest-to-goodness clams?

[']I'm a real, slam-bang, honest-to-goodness, three-fisted humdinger. I'm a bona fide supraman.' 'Superman?' Clevinger cried. 'Superman?' 'Supraman,' Yossarian corrected.

At first glance, Lincoln seemed caught in a time warp—a place of 1930s tourist cabins and Mom-and-Pop diners where one could get honest-to-goodness milk shakes, made in a blender with real ice cream.

Captain Mark heard about it; and dropped in after school to commend his protege. "Young lady, that's the most honest-to-goodness useful thing I ever heard hail from a schoolroom!"