Might not be the best solution, but maybe start by tracing out the curve, or sections of the curve, on some wooden blocks and then try and cut them as accurately as possible. Try and file and smooth them further. You can then use these as forms for shaping metal sections perhaps or whatever other material you want to form/shape. Remember the shape is actually a paraboloid in 3 dimensions, not just a parabolic curve in 2 dimensions (which would simply yield a half-cylinder kind of shape in three dimensions, almost like a skateboard half-pipe kind of thing, lacking the curving part in the other direction). That curve on paper is only one thin section (like cutting a thin section out of the centre part of the dish), the dish is curved in not just one "direction", but in two at 90 degrees to each other (a simple dish).
So, maybe it's good to start with making the petal-shaped wooden forms, which eventually will fit like pieces of a pizza, starting with wooden blocks whose lengths are as long (or more) as the radius of your dish (90 cm), whose breadths will be big enough to accommodate the widest part of your "pizza slice" and whose thicknesses are as large or more than the "depth" of your curve (i.e. that change in distance from the ends of your curve to the point in its centre, change in "y-coordinate" if you speak in mathematical terms).
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