Clean the pineapple and peel the skin thickly. Grate it. Do not take the hard portion inside the pineapple. Filter the grated pineapple through a clean cloth and take the juice out of it. Keep it aside and allow to cool.
Heat the water and add sugar and citric acid to it. When the sugar completely dissolves, remove from fire and sieve through a thin cloth. Allow it to cool.
Add the pineapple juice in the sugar solution. Stir it well. Add the colour and essence. Dissolve potassium meta bisulphate in some water and mix it with the squash. Keep it in an air tight bottle.