Index.cshtml

@using SolrNet;
@using Sitecore.ContentSearch.SearchTypes

@model SolrQueryResults<SearchResultItem>

@if (Model != null)
{
    foreach (var group in Model.Grouping)
    {
        foreach (var grp in group.Value.Groups)
        {
            <div class="group">
                <div class="group-header">
                    @grp.GroupValue
                </div>
                <div class="group-item">
                    @foreach (var item in grp.Documents)
                    {
                        <span>@item["Name"] - @item["Language"]</span>
                    }
                    
                </div>
            </div>
        }
    }
}