Make sure not to slice the squash too thin, and don’t overcook the squash. Watch it closely as it cooks, and remove it from the grill as soon as it begins to brown and caramelize.u003cbr/u003eu003cbr/u003eAnother option is to sprinkle the sliced squash with a little salt before placing it on the grill. The salt helps to pull some of the moisture out of the squash, and it’s less likely to be mushy after it cooks.