var data = {
"base" : ["Please choose from above"],
"beverages": ["Coffee_465","Coke_984"],
"snacks": ["Chips_123","Cookies_987"]
}
assign data key value like optionText_optionValue
and
$.each(vals,function(i,val){
var v = val.split('_'); //use split to break optionText and optionValue
html.push('<option value="'+v[1]+'">'+v[0]+'</option>')
});