Step 1:
This large paper is made of three squares taped together.
Prefold in half.

Pull the bottom outwards... Done!
Click here for diagrams of the strawberries and icecream

Printable strawberry papers are available here:  
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Step 8:
Fold this edge downwards

Step 6:
Make zig zag folds, all lines are already prefolded.

Step 13:
Press the top of the pudding downwards, use tape or glue to connect all edges (if necessary)

Step 12:
Tape or glue the parts indicated by the white rectangles together

Step 11:
Now the model looks like this.

Step 10:
Repeat step 8 on the other edges, see arrows

Step 9:
Repeat step 8 with this edge

Step 5:
Prefold.

Step 7:
Now the model looks like this

Step 3:
Fold the edges to the centerline.

Step 2:
Fold the edges to the centerline.

Step 4:
Prefold over these four lines, all six parts are the same size.
Then, unfold the model.

This Origami video also has instructions for making the pudding: