Assign a value on the center of a surface using pseudocolor plot

Using the following code I generate the graph. Values of C are defined in the X,Y coordinates that is not what I want.

What I want is to assign a single value on the surface of each of 3x2 surface. Each value would be defined by a C [3x2] matrix.

close all;clear all;clc

x = linspace(0,10,4);
y = linspace(0,20,3);
[X,Y] = meshgrid(x,y)
C = rand(3,4);
pcolor(X,Y,C)
colorbar
xlabel('x-axis')
ylabel('y-axis')
zlabel('C')