Creamy Tomato Soup

Adapted from a recipe I found online (source: Ted's Bulletin, an upscale comfort food diner in Washington). My daughters love tomato soup, but aren't excited for any deviation from basic tomato flavor — I once added some ginger and was chastised for making the soup "too spicy." This recipe elicits high marks from the kids and the adults.

• 4 tbsp unsalted butter
• 2 tbsp olive oil
• 1 large sweet onion, diced
• 1/3 cup flour
• 1 can San Marzano tomatoes in sauce (28 oz; I like Cento)
• 1/4 cup granulated sugar
• 1 tbsp kosher salt
• 1 tsp celery seed
• pinch of ground black pepper
• 1 1/2 cup chicken stock
• 1 tbsp honey
• 1/3 cup half-and-half