FYI, a lot of trial and error, but this seemed to work for me to change the color of the hover on both the word MENU and the icon.
.menu-toggle:hover, .menu-toggle:active {
color: #955251;
}
.menu-toggle:hover:before,
.menu-toggle:active:before,
.menu-toggle.open:before,
.menu-toggle.open {
color: #955251;
}
.menu-toggle:hover:before,
.menu-toggle:active:before,
.menu-toggle.open:before {
background: #fff;
border-color: #955251;
}