Wash and dry produce.

Halve, peel, and thinly slice shallot. Halve and core apple; thinly slice into half-moons.

Heat a drizzle of oil and 1 TBSP butter (2 TBSP for 4 servings) in a large pan over medium-high heat. Add shallot, half the apple, ¼ tsp thyme (½ tsp for 4), and salt; cook, stirring occasionally, until slightly tender, 3-4 minutes.

Add 2 TBSP water (4 TBSP for 4). Cook, stirring continuously, until water has evaporated, 30-60 seconds; season with pepper.

Turn off heat; transfer to a small bowl. Wipe out pan.

Place sourdough on a clean work surface. Spread half the slices with fig mustard, then top with cooked apple and gouda. Top with remaining bread to create sandwiches.

Melt 1 TBSP butter in pan used for apple over medium heat. Add sandwiches and cook until golden brown on first side, 3-4 minutes.

Remove sandwiches from pan; add another 1 TBSP butter. Once melted, return sandwiches to pan and cook on second side until bread is golden brown and cheese melts, 3-4 minutes more. (For 4 servings, cook in batches, adding 1 TBSP butter per side.)

In a large bowl, toss lettuce, tomatoes, cucumber, and remaining sliced apple with dressing. Taste and season with salt and pepper.