Tkinter create buttons iteratively, but be able to configure specific buttons

I need to create 100 buttons in a 10x10 grid. I've done this, and managed to find which button is being pressed using lambda and sending a values along with it (x and y), as shown below.

        def button_pressed(buttonx, buttony):
            print(buttonx, buttony)
            if self.currentNonogram[buttony][buttonx] == 1:
                print("correct")
            else:
                print("incorrect")
        # Buttons
        for x in range(1, 11):
            tk.Label(text=self.rows[x-1]).grid(row=x+4, column=2)
            for y in range(1, 11):
                self.labelText = str(self.columns[y-1])
                self.labelText = self.labelText.replace("[", "")
                self.labelText = self.labelText.replace("]", "")
                self.labelText = self.labelText.replace(",", "")
                self.labelText = self.labelText.replace(" ", "\n")
                tk.Label(text=self.labelText).grid(row=3, column=y+2)
                tk.Button(width="1", height="1", command = lambda y=y,x=x:button_pressed(x-1, y-1)).grid(row=x+4, column=y+2)

In the function which is called when the buttons are pressed, where it prints "correct" I want to change the background colour of the buttons to black, but I can't figure out a way to configure a specific one of these buttons like this, as usually this would be done by the name, and clearly I don't want to have to create separate names for each button.

Thanks!