The fruits should be treated with lemon juice when sliced to prevent oxidation.
The fruits are sliced
Once you have sliced and treated the fruits, you have sliced fruit ready to go.
exists e1 p1 x1.(n_fruit(x1) & exists e2 e3 p2 x2 x3.(when(e2,e3) & Recipient(e3,p2) & Topic(e3,x1) & v_slice(e3) & exists e4 x4.(Theme(e4,x4) & Actor(e4,x1) & v_prevent(e4) & n_oxidation(x4)) & with(e2,x2) & n_juice(x2) & of(x2,x3) & n_lemon(x3) & Theme(e2,x1) & v_treat(e2)) & Topic(e1,p1) & Actor(e1,x1) & v_should(e1))
exists e1 x1.(n_fruit(x1) & Theme(e1,x1) & v_slice(e1))